Vasey, Daniel E.
An ecological history of agriculture: 10,000 B.C.-A.D. 10,1000
Iowa State University Press, 1992
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Altieri, Miguel A
Agroecology: the scientific basis of alternative agriculture
Westview Press, 1987
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Agroecology : researching the ecological basis for sustainable agriculture
editor, Stephen R. Gliessman
Springer-Verlag, 1990
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Advances in soil organic matter research: the impact on agriculture and the environment
by W.S. Wilson ... [and others]
Royal Society of Chemistry, 1991
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Schultz, Theodore W.
Agriculture in an ucstable economy / Theodore W. Schultz
McGraw-Hill, 1945
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