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by Ehrlich, Paul R.
by Andrew Beattie and Paul R. Ehrlich; With illustrations by Christine Turnbull
by Williamson, Miryam Ehrlich; St. Amand, Paul
by John M. Marzluff and Tony Angell; Illustrated by Tony Angell; Foreword by Paul Ehrlich
by Ehrlich, Paul R.; Ehrlich, Anne H.
by Darryl Wheye and Donald Kennedy; Foreword by Paul R. Ehrlich