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by Sodhi, Navjot S.; Ehrlich, Paul R.
by Ehrlich, Paul E.; Ceballos, Gerardo; Ehrlich, Anne H.
by Gustafson, J. Perry; Raven, Peter H.; Ehrlich, Paul R.
by Kahn, Sandra; Ehrlich, Paul R.
by Ehrlich, Paul; Dobkin, David S.; Wheye, Darryl
by John M. Marzluff and Tony Angell; Illustrated by Tony Angell; Foreword by Paul Ehrlich
by Ehrlich, Paul
by Lazarus, Paul Ehrlich Adolf
by Kahn, Sandra; Ehrlich, Paul R.; Sapolsky, Robert