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1

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Population, resources, environment; : issues in human ecology [by] Paul R. Ehrlich [and] Anne H. Ehrlich..

by Ehrlich, Paul R.
Published 1972

2

Ark II; social response to environmental imperatives [by] Dennis C. Pirages [and] Paul R. Ehrlich..

by Pirages, Dennis.
Published 1973

Other Authors: '; “...Ehrlich, Paul R.,...”