Población recursos medio ambiente : aspectos de ecología humana /

by Ehrlich, Paul R., 1932-
Published 1975

The birder's handbook : a field guide to the natural history of North American birds, including all species that regularly Breed North of México /

by Ehrlich, Paul R., 1932-
Published 1988

Introductory biology /

by Ehrlich, Paul R., 1932-
Published 1973

Population resources enviroment : issues in human ecology /

by Ehrlich, Paul R., 1932-
Published 1972

Introducción a la biología /

by Ehrlich, Paul R., 1932-
Published 1974

Nature conservation 3 : reconstruction of fragmented ecosystems : global and regional perspectivas /

Published 1993

Introduction to insect biology and diversity /

by Daly, Howell V.
Published 1998