...A little soil lying on calcareous tufa, over a tract of several hundreds of miles, supports a vegetation of fine sweet short grass, and mopane and baobab trees... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The Chambezi, the name given to its most southern extremity, drains a large tract of country south of the southernmost source of the Tanganika; it must, therefore, be the most important...
Henry M. Stanley 「How I Found Livingstone」
...The journey across the desert tract was performed on donkeys, the luggage being carried on camels or dromedaries...
W.H.G. Kingston 「Great African Travellers」
...Southwards the dry tract falls into low and wooded ground...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...But with these people it was totally different, for they were inhabiting a fine agricultural tract of country, which also abounded in game...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...It is by far the most extensive tract of cultivated land that we have seen in the island, and is improved to its utmost capacity...
Horatio Bridge 「Journal of an African Cruiser」
...On these accounts, the tract now called Liberia (extending about three hundred miles, from Cape Mesurado to Cape Palmas) was the most open for the purposes of colonization...
Horatio Bridge 「Journal of an African Cruiser」
...Consequently, there are hardly more than thirty cattle left in a tract of country capable, in its present state, of sustaining a thousand...
Horatio Bridge 「Journal of an African Cruiser」
...The American Bible Society, the American Tract Society, and the cause of the Foreign Missions, found in him a liberal friend...
William Wells Brown 「Clotelle」
... When additional land was required for cultivation the first step was to go into the forest in summer and "deaden" or girdle the trees on a given tract...
Louis Hughes 「Thirty Years a Slave」
...In some instances part of the tract is fenced,while large unenclosed areas are protected by being posted...
William T. Hornaday 「Our Vanishing Wild Life」
...Blanford has shown, is Blyth's nameBactrianus, for it does not inhabit that tract, so the originaltitle stands...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
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unprovoked beaked Cordova
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