47 résultats pour "tractée"
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Antibiotics.
In some species of bacteria the cell wall consists primarily of a thick layer of peptidoglycan. Other species have a much thinner layer of peptidoglycan and an outer aswell as an inner membrane. When bacteria are subjected to Gram's stain, these differences in structure affect the differential staining of the bacteria with a dye calledgentian violet. The differences in staining coloration (gram-positive bacteria appear purple and gram-negative bacteria appear colorless or reddish, depending on t...
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Bangladesh - country.
F Environmental Issues Waterborne diseases such as cholera are a serious threat to public health in Bangladesh. Until the 1970s, many of Bangladesh’s people became sick from drinkingpolluted water drawn from surface rivers. Aid agencies such as the United Nations Children’s Fund (UNICEF) built shallow wells throughout the country to help provide asafe source of drinking water to Bangladesh’s poor. In the 1990s, however, it was discovered that many of these wells were contaminated by arsenic, a...
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Tractant fabrilia fabri
Tractant fabrilia f abri Les forgerons s'occupent de travaux de forgerons Cette expression, encore citée aujourd'hui pour affi111.~r que chacun doit s'occuper de ce qu'il sait vraiment faire, dérive d'un passage d'Horace (Ep., 2, 1, 115-117), qui compare les différents traités philosophiques à la poésie., celle-ci pet ,,.~ttant d'approcher plus profitablement la morale : Quod medicorum est I promittunt medici, tractant fabrilia /abri : / scrihimus indocti doctique poemata passim, >. Ce...
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Saskatchewan (province) - Geography.
The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...
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Saskatchewan (province) - Canadian History.
The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...
- L'énergie au service de l'Homme Charrue tractée par un âne dans un champ en Crète, Grèce.
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Halte à quelques mètres du quai, dans une rue parallèle, pour échapper au feu des ennemis qui tirent de l'autre
ive.
classant lesderniers rapports deHongkong, deslumières s’allument ; etlanuit tout àfait venue, jen’entends plus que desdétonations isolées,perdues… Lorsque jeredescends aupremier étage,unerumeur deparoles etdes bruits d’armes viennent, parlesfenêtres, de larue nocturne. Prèsdesautos, danslalumière triangulaire desphares, dessilhouettes decadets secroisent, noires, rayéesdebarres quibrillent : desarmes. Unbataillon deChang-Kaï-Shek estdéjà dans larue. Onne distingue rienhors desfaisceaux lumineux...
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Diseases of Animals.
infected animal. It may also spread in milk or in garbage that contains contaminated meat. Typical symptoms include blisters that appear on the mouth and feet;animals may become lame when their hooves degenerate. Canine distemper is a highly contagious disease caused by the paramyxovirus, which is transmitted in discharges from the nose and eyes. Symptoms begin with fever,malaise, and nasal and ocular discharges and may progress to convulsions and other nervous system disorders. Parvoviruses aff...
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Virus (life science) - biology.
RNA into DNA earned them their name because this process is the reverse of the usual transfer of genetic information, from DNA to RNA.) The DNA form of theretrovirus genome is then integrated into the cellular DNA and is referred to as the provirus. The viral genome is replicated every time the host cell replicates its DNA and is thus passed on to daughter cells. Hepatitis B virus can also transcribe RNA to DNA, but this virus packages the DNA version of its genome into virus particles. Unlike...
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Insect - biology.
they almost always have six legs. In some insects, such as beetles, the legs are practically identical, but in other insects each pair is a slightly different shape. Still otherinsects have specialized leg structures. Examples are praying mantises, which have grasping and stabbing forelegs armed with lethal spines, and grasshoppers andfleas, which have large, muscular hind legs that catapult them into the air. Mole crickets’ front legs are modified for digging, and backswimmers have hind legs de...
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Dada - peinture.
groupe de la revue Littérature — fondée en 1919 — André Breton, Philippe Soupault et Louis Aragon, qui finissent quelques années plus tard par délaisser Dada pour donner naissance au surréalisme. Entre 1920 et 1921, le dadaïsme parisien s’illustre par de nombreuses manifestations placées sous les signes du militantisme social et de l’anarchie, et se soldent le plus souvent par des échecs publics. Les dadaïstes ont des tenues vestimentaires et un registre de langue qui s’accordent mal à un au...
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Native American Policy.
of white settlement dominated policy during the second quarter of the 19th century. IV REMOVAL PERIOD The idea of moving Native Americans to a different part of the country was not new. After the Louisiana Purchase in 1803, President Thomas Jefferson had suggestedthat tracts of land in this vast new territory could be given to native peoples if they agreed to cede their lands in the eastern part of the country. Transfers occurred in apiecemeal way, but no consistent removal program developed u...
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Manitoba - Geography.
E Plant Life Forests cover 66 percent of Manitoba. The main forest area is divided into the boreal forest and the mixed-wood forest. The boreal, or northern, forest containsconiferous (cone-bearing) trees, especially white and black spruce, balsam fir, and jack pine. South of the boreal forest is the mixed-wood forest, which contains conifers as well as such deciduous trees as white birch, aspen, poplar, and Manitoba maple. Prairie land is found in the southwest, where the natural vegetation i...
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Manitoba - Canadian History.
E Plant Life Forests cover 66 percent of Manitoba. The main forest area is divided into the boreal forest and the mixed-wood forest. The boreal, or northern, forest containsconiferous (cone-bearing) trees, especially white and black spruce, balsam fir, and jack pine. South of the boreal forest is the mixed-wood forest, which contains conifers as well as such deciduous trees as white birch, aspen, poplar, and Manitoba maple. Prairie land is found in the southwest, where the natural vegetation i...
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South Carolina - geography.
(20° F) or lower, occur each winter. July temperatures average 27° C (80° F) in most of the state, with temperatures in the lower 20°s C (lower 70°s F) in themountains. Except in the mountains, summer daytime highs throughout South Carolina often enter the lower 30°s C (lower 90°s F). The temperature in July in Columbiaranges from 21° to 33° C (70° to 92° F). D2 Precipitation Central South Carolina has an average annual precipitation (both rainfall and snowfall) of 1,140 mm (45 in). Greater amo...
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South Carolina - USA History.
(20° F) or lower, occur each winter. July temperatures average 27° C (80° F) in most of the state, with temperatures in the lower 20°s C (lower 70°s F) in themountains. Except in the mountains, summer daytime highs throughout South Carolina often enter the lower 30°s C (lower 90°s F). The temperature in July in Columbiaranges from 21° to 33° C (70° to 92° F). D2 Precipitation Central South Carolina has an average annual precipitation (both rainfall and snowfall) of 1,140 mm (45 in). Greater amo...
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Respiratory System.
rapidly, or laughs while swallowing, the swallowing reflex may not work, and food or fluid can enter the larynx. Food, fluid, or other substances in the larynx initiate acough reflex as the body attempts to clear the larynx of the obstruction. If the cough reflex does not work, a person can choke, a life-threatening situation. TheHeimlich maneuver is a technique used to clear a blocked larynx ( see First Aid). A surgical procedure called a tracheotomy is used to bypass the larynx and get air to...
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John Milton
I
INTRODUCTION
John Milton
Seventeenth-century writer John Milton ranks as one of the greatest poets in the history of English literature.
liberty to know, to utter, and to argue freely according to conscience, above all liberties.” In Of Education (1644) Milton advocated an education combining classical instruction, to prepare the student for government service, with religious training. The third group of pamphlets includes those Milton wrote to justify the execution of Charles I. The first of these, The Tenure of Kings and Magistrates (1649), deals with constitutional questions and particularly with the rights of the people a...
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Influenza.
days and disappear in seven to ten days. However, coughing and fatigue may persist for two or more weeks. Death from influenza itself is rare. But influenza can aggravate underlying medical conditions, such as heart or lung disease. Invading influenza viruses produceinflammation in the lining of the respiratory tract, damage that increases the risk that secondary infections will develop. Common complications include bronchitis,sinusitis, and bacterial pneumonia, occurring most frequently in olde...
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Souvent considérée comme un volet secondaire de l'histoire proprement dite, l'histoire
des techniques n'a suscité la création que d'un petit nombre de chaires magistrales et ne fait
pas l'objet de multiples publications.
repos – ce qui empêcha pendant deux millénaires toute possibilité d'établissement d'une dynamique cohérente (étude des mouvements sous l'effet des forces qui les produisent). Il fallut attendre 1687 pour que Newton établisse que la charge tractée s'arrêtait sous l'effet des forces de frottement, mais qu'un corps libre et non sollicité dans l'espace décrivait, quant à lui, un mouvement rectiligne uniforme, inaugurant ainsi l'approche de la dynamique théorique et de l'ensemble de la mécanique r...
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Metabolism (chemistry) - biology.
nearly perfect balance. Although much remains to be revealed about metabolic processes, biochemists now agree that regulatory, or rate-limiting, enzymes figure largely in the reactionsinvolved ( see Enzyme). Affecting metabolic pathways at the earliest steps, each enzyme molecule has a specific, or active, site that matches, or “fits,” its particular substrate—the compound with which the enzyme forms a product. The precision with which rate-limiting enzymes and substrates join to set off a parti...
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Dog.
I
INTRODUCTION
Dog, mammal generally considered to be the first domesticated animal.
French word for butterfly because it has ears that resemble butterfly wings, is a happy, friendly dog, suitable for small living spaces. The final dog group, nonsporting ,includes a wide variety of purebreds that differ in size, coat, overall appearance, and personality, from the shorthaired spotted dalmatian to the curly-haired poodle. V DOG BEHAVIOR Instinctive behaviors of the domestic dog are comparable to those of its wild relatives, the wolf, coyote, fox, and jackal. Unlike trained behavi...
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Dog - biology.
French word for butterfly because it has ears that resemble butterfly wings, is a happy, friendly dog, suitable for small living spaces. The final dog group, nonsporting ,includes a wide variety of purebreds that differ in size, coat, overall appearance, and personality, from the shorthaired spotted dalmatian to the curly-haired poodle. V DOG BEHAVIOR Instinctive behaviors of the domestic dog are comparable to those of its wild relatives, the wolf, coyote, fox, and jackal. Unlike trained behavi...
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Human Nutrition.
is one of the most preventable types of cancer. Nutritionists caution that most Americans need to eat more complex carbohydrates. In the typical American diet, only 40 to 50 percent of total calories come fromcarbohydrates—a lower percentage than found in most of the world. To make matters worse, half of the carbohydrate calories consumed by the typical American comefrom processed foods filled with simple sugars. Experts recommend that these foods make up no more that 10 percent of our diet, bec...
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Cancer (medicine).
unable to repair the DNA damage, p53 instructs the cell to undergo programmed cell death, or apoptosis , putting a stop to runaway cell division before it starts. Programmed cell death is a normal part of cell life and is tightly controlled by many genes, primarily p53. In a cancerous cell, one or more mutations prevent these genes from doing their jobs. When mutated, p53 allows a cell to continue to divide, even with damaged DNA.This can lead to additional mutations in proto-oncogenes or tumor...
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New Jersey - geography.
C Soils Broadly defined, all of New Jersey’s soils are podzolic soils; that is, they are acidic and contain fairly high amounts of iron oxides. The soils in northern New Jersey areirregular in quality and contain rock fragments and small stones deposited by the continental glaciers of the last Ice Age. The soils of the inner coastal plain, unaffectedby glaciation, are the richest in the state, while those of the outer coastal plain are generally infertile. The newer soil classification system d...
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New Jersey - USA History.
C Soils Broadly defined, all of New Jersey’s soils are podzolic soils; that is, they are acidic and contain fairly high amounts of iron oxides. The soils in northern New Jersey areirregular in quality and contain rock fragments and small stones deposited by the continental glaciers of the last Ice Age. The soils of the inner coastal plain, unaffectedby glaciation, are the richest in the state, while those of the outer coastal plain are generally infertile. The newer soil classification system d...
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Sunt p•eri puer;, p11~,; puerilia tractant
Les enfants sont des enfants et les enfants s'occupent d'affaires
d'enfants
L'auteur de cette...
Sunt p•eri puer;, p11~,; puerilia tractant Les enfants sont des enfants et les enfants s'occupent d'affaires d'enfants L'auteur de cette sentence, célèbre surtout chez les auteurs ge1111ilniques (cf. par exemple, Hans Christian Andersen [lucky Peer, 11); Gustav Meyrink [Des deutschen Spiessers Wunderhorn. Das Ai,tomobil], et Bilchmann 68) est d'un auteur anonyme, qui s'est sans doute inspiré d'un passage de la première épitre de saint Paul aux l ..orinthiens ( 13, 11 : OTE ~µ JlV Vl11TlOS. ÈÀaAo...
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Liver.
by bacterial infections. But hepatitis is most often caused by one of several viruses. The hepatitis A virus (HAV) can produce flulike symptoms and jaundice, but manypeople who contract it have no symptoms. The disease tends to resolve on its own. Because HAV lives in feces in the intestinal tract, hepatitis A is prevalent in areaswhere drinking water is contaminated with raw sewage. Good hygiene practices and a hepatitis A vaccination are effective measures of prevention. Hepatitis B is a more...
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Après une histoire généralement chaotique, les transports urbains amorcent, partout
dans le monde, une convergence vers des solutions communes.
et Saint-Cloud. Complétez votre recherche en consultant : Les corrélats concession fiacre lettres patentes Paris - Histoire - Paris, ville des rois et des révolutions Pascal Blaise tramway Les livres métropolitain - chantier de construction de la première ligne de métro parisienne, page 3166, volume 6 transports urbains - embarras de Paris, gravure du XVIIIe siècle, page 5262, volume 10 transports urbains - inauguration de la première ligne hippomobile de tramway à Baltimore, en 18...
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missiles
1
PRÉSENTATION
missiles, projectiles aériens autopropulsés, guidés durant leur vol vers une cible par contrôle à distance ou grâce à des équipements embarqués.
peuvent attaquer un ensemble d’objectifs distincts. Les États-Unis ont également renouvelé le concept de missile de croisière aérobie dans des missions tant stratégiques que tactiques. Le Tomahawk peut être tiré du sol, d’un navire, d’un avion ou d’un sous-marin, contre des cibles tactiques à faibles distances telles que des bateaux, aussi bien que contre des cibles stratégiques éloignées de plusieurs milliers de kilomètres. La version antinavire évolue à quelques mètres au-dessus du niveau de l...
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Kidney.
secretion. An additional function of the kidney is the processing of vitamin D; the kidney converts this vitamin to an active form that stimulates bone development. Several hormones are produced in the kidney. One of these, erythropoietin, influences the production of red blood cells in the bone marrow. When the kidney detectsthat the number of red blood cells in the body is declining, it secretes erythropoietin. This hormone travels in the bloodstream to the bone marrow, stimulating theproducti...
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Biodiversity.
a common molecule, ribonucleic acid (RNA), and most also have deoxyribonucleic acid (DNA). These molecules direct the production of proteins—molecules responsiblefor the structure and function of virtually all living cells. This is the evolutionary chain of life. All species are descended from a single common ancestor. From that ancient single-celled microbe, all inherited RNA. As time goesby, species diverge and develop their own peculiar attributes, thus making their own contribution to biodiv...
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Biodiversity - biology.
a common molecule, ribonucleic acid (RNA), and most also have deoxyribonucleic acid (DNA). These molecules direct the production of proteins—molecules responsiblefor the structure and function of virtually all living cells. This is the evolutionary chain of life. All species are descended from a single common ancestor. From that ancient single-celled microbe, all inherited RNA. As time goesby, species diverge and develop their own peculiar attributes, thus making their own contribution to biodiv...
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Fruit - biology.
from a flower with several pistils. The ovary may have a single compartment, or carpel, which houses the ovule or ovules. Or the ovary may consist of two or morecarpels, each of which may contain one or more ovules. A drupe develops from an ovary with a single carpel and is characterized by an edible exocarp and mesocarp and an inedible, hard endocarp, or pit that encloses asingle seed. Cherries, peaches, apricots, and plums are examples of drupes. Almonds also are classified as drupes, but in a...
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Snake (reptile).
in their heads that conduct sound. They are able to hear low-frequency sounds and to sense vibrations that travel through the ground or water. The majority of snakeshave good eyesight, especially for detecting moving objects, although most burrowing snakes can only distinguish between light and dark. Pit vipers, boas, and pythons have an unusual adaptation for detecting warm-blooded prey and predators. On the heads of these snakes are small pits lined with cellsthat are extremely sensitive to he...
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Honduras - country.
A Principal Cities The capital and largest city of Honduras is Tegucigalpa (2006 estimate, 1,324,000), located in the south-central highlands region. The country’s second largest city isSan Pedro Sula (549,498). The principal city and commercial center in the north, it lies in the heart of the vast banana plantations on the Caribbean Sea. La Ceiba(127,590) and Puerto Cortés (90,161) are among the leading Caribbean ports. B Language and Religion Spanish is the official language and is spoken by...
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National Parks and Preserves.
Some ibex raised in Italy’s 700 sq km (220 sq mi) Gran Paradiso National Park (1922) were transferred to aid herd restoration elsewhere in the country. Switzerlandreturned lynx to Swiss National Park to keep red deer populations in check. The growth of national parks also enabled many European countries to restore forests thathad given way to industrialization by the early 20th century. Africa’s wildlife was hunted heavily from the late 19th century well into the 20th century. By 1920 big-game h...
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Ant - biology.
The workers of many ant species carry a stinger within the hind end of the gaster. These ants use the stinger to defend against their enemies. In some species, workerants lack a stinger but use the tip of their gaster to squirt or dab poison at other small animals and when fighting battles with other ants, fending off predators, or killinginsects or other animals that they use as food. III PHYSIOLOGY Ants have a rigid, external skeleton called an exoskeleton that gives the soft, inner body its...
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Newfoundland and Labrador - Geography.
Precipitation averages about 1,120 mm (about 44 in) yearly in Newfoundland. In Labrador precipitation varies from about 1,020 mm (about 40 in) in the southeast toabout 510 mm (about 20 in) in the extreme north. Heavy winter snowfalls are common, especially in Newfoundland. D Plant Life About one-third of Newfoundland is forested, and most of the rest of the island is made up of barren areas of reindeer moss and lichens. The forests consist almostentirely of conifers. The most important species...
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Newfoundland and Labrador - Canadian History.
Precipitation averages about 1,120 mm (about 44 in) yearly in Newfoundland. In Labrador precipitation varies from about 1,020 mm (about 40 in) in the southeast toabout 510 mm (about 20 in) in the extreme north. Heavy winter snowfalls are common, especially in Newfoundland. D Plant Life About one-third of Newfoundland is forested, and most of the rest of the island is made up of barren areas of reindeer moss and lichens. The forests consist almostentirely of conifers. The most important species...
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Abraham Lincoln
I
INTRODUCTION
Abraham Lincoln (1809-1865), 16th president of the United States (1861-1865) and one of the great leaders in American history.
fence in 4 hectares (10 acres) to grow corn. Then he hired out to neighbors, helping them to split rails. That year, Lincoln attended a political rally and was persuaded tospeak on behalf of a local candidate. It was his first political speech. A witness recalled that Lincoln “was frightened but got warmed up and made the best speech of theday.” In 1831 Lincoln made a second trip to New Orleans. He was hired, along with his stepbrother and a cousin, by Denton Offutt, a Kentucky trader and specul...
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Abraham Lincoln.
fence in 4 hectares (10 acres) to grow corn. Then he hired out to neighbors, helping them to split rails. That year, Lincoln attended a political rally and was persuaded tospeak on behalf of a local candidate. It was his first political speech. A witness recalled that Lincoln “was frightened but got warmed up and made the best speech of theday.” In 1831 Lincoln made a second trip to New Orleans. He was hired, along with his stepbrother and a cousin, by Denton Offutt, a Kentucky trader and specul...
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Abraham Lincoln
fence in 4 hectares (10 acres) to grow corn. Then he hired out to neighbors, helping them to split rails. That year, Lincoln attended a political rally and was persuaded tospeak on behalf of a local candidate. It was his first political speech. A witness recalled that Lincoln “was frightened but got warmed up and made the best speech of theday.” In 1831 Lincoln made a second trip to New Orleans. He was hired, along with his stepbrother and a cousin, by Denton Offutt, a Kentucky trader and specul...
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Abraham Lincoln - USA History.
fence in 4 hectares (10 acres) to grow corn. Then he hired out to neighbors, helping them to split rails. That year, Lincoln attended a political rally and was persuaded tospeak on behalf of a local candidate. It was his first political speech. A witness recalled that Lincoln “was frightened but got warmed up and made the best speech of theday.” In 1831 Lincoln made a second trip to New Orleans. He was hired, along with his stepbrother and a cousin, by Denton Offutt, a Kentucky trader and specul...
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Australia - country.
itself forms most of the border between New South Wales and Victoria. Considerable lengths of the Murray, Darling, and Murrumbidgee rivers are navigable during thewet seasons. The central plains region, also known as the Channel Country, is interlaced by a network of rivers. During the rainy season these rivers flood the low-lying countryside,but in dry months they become merely a series of water holes. The Victoria, Daly, and Roper rivers drain a section of the Northern Territory. In Queensland...
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Australia - Geography.
itself forms most of the border between New South Wales and Victoria. Considerable lengths of the Murray, Darling, and Murrumbidgee rivers are navigable during thewet seasons. The central plains region, also known as the Channel Country, is interlaced by a network of rivers. During the rainy season these rivers flood the low-lying countryside,but in dry months they become merely a series of water holes. The Victoria, Daly, and Roper rivers drain a section of the Northern Territory. In Queensland...