...(This volume contains many tracts on the African slave-trade,especially in the West Indies; also descriptions of trade,proposed legislation, etc... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
... Very large tracts of country are denuded of old grass during the winter by means of fire, in order to attract the game to that which there springs up unmixed with the older crop...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Sekeletu favored the missionary, not as the man who could give him Bibles and tracts, but as the one by whose help he hoped to sell his ivory for a rifle, a sugar-mill, and brass wire...
David Livingstone 「Missionary Travels and Researches in South Africa」
...The soil of West Africa is extremelyrich in places, but by no means so in all, for vast tracts of it aremangrove swamps, and other vast tracts of it are miserably poor, sour,sandy clay...
Mary H. Kingsley 「Travels in West Africa」
...At places the water from the canal had overflowed wide tracts of country...
Stewart Edward White 「African Camp Fires」
...We passedthrough wide tracts of ghaseb stubble...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...I have foundit in abundance in the Raigarh Bichia tracts of Mundla, at one timeattached to the Seonee district, but now I think incorporated in thenew district of Balaghat...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...As a rule only one food item was present in a digestive tract, but a few tracts contained several items of the same or different species...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...) were found in the stomach of each of several preserved specimens; most of these snakes had no food in their digestive tracts...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Many of the great ranches in the valley possessedprescriptive rights to pasturage overvast tracts in the high Sierras...
Various 「Hunting in Many Lands」
...In portions of Kansas tracts of this kind arescattered over the country along the margins of theriver and creek valleys and ravines...
W. E. Webb 「Buffalo Land」
...
With a busy company of friends, the killdeer haunts broad tracts ofgrassy land, near water-uplands or lowlands, or marshy meadows besidethe sea...
Neltje Blanchan 「Birds Every Child Should Know」
...The tracts of the sheep might be seen by thedisappearance of the "gentle dew" from their path as they proceeded totheir pasture, driven by the watchful colley...
Edward Jesse 「Anecdotes of Dogs」
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