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acres Africa agriculture animals Arctic Arctic Ocean arctic raspberries Australia bacteria basic become Caspian Seas cattle causes cent century chemical cities civilization collective farm conservation continue covered crops cultivation damage decades desert destruction developed Dust Bowl early earth effect elements erosion Europe exist fact fertile forests grazing Greece growing growth happened human increasing industry land resources livestock living resources living things man's manure ment Mesta methods millions mineral misuse mountain nations nature needs nomadic North numbers observations organic overgrazing plants podsol Pontine Marshes population present processes productive lands productive soil protection rabbits races rainfall rains reason recent regions result rivers Russia sheep situation slopes sources South South America Soviet Spain square miles strips subsistence terraces tion topsoil total land area trees tsetse fly United valley vast Volga Western Western Australia bordering wool
From Google Scholar
HH Janzen - 2004 - Agriculture, Ecosystems and Environment
Lynton Keith Caldwell - 1999 - Politics and the Life Sciences
Wilbur Zelinsky - 1970 - Economic Geography
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Larry David Wilson, James R McCranie - 2004 - Amphibian and Reptile Conservation
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MAXIMUM EFFICIENCY OF EXPLOITATION: A PRAGMATIC THEORY OF RESOURCE ...
Our plundered planet. [worldcat.org]
Core Historical Literature of Agriculture
AEI - Short Publications - Fate of the World Redux
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University of Chicago Press - Books - 10.1086/322549
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