Algae as ecological indicators
editod by L. Elliot Shubert
Acedemic Press, 1994
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Harborne, J.B., author
Introduction to ecological biochemistry
Academic Press Limited, 1993
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Allee, W.C., author
Ecological animal geography
John Wiley & Sons, 1963
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Holdren, John P., author
Man as a global ecological force
California Institute of Technology , 1973
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McElroy, Ann
Medical anthropology in ecological perspective
Westview Press, 1996
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