Brewer, Richard
The science of ecology
Saunders College Publishing, 1994
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Ehrlich, Paul R.
The science of ecology
Macmillan, 1987
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Colinvaux, Paul A.
Introduction to ecology
John Wiley & Sons, 1973
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Kormondy, Edward J.
Concepts of ecology
Prentice-Hall, 1976
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Krohne, David T.
General ecology
Brook/Cole, 2001
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