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by Marc Bekoff
by Jessica Pierce; Marc Bekoff
by Goodall, Jane; Bekoff, Marc
by Bekoff, Marc; Goodall, Jane
by Bekoff, Marc
by Kathleen M. Dudzinski, Ph.D., and Toni Frohoff, Ph.D.; Foreword by Marc Bekoff,Ph.D.
by Anderson, Allen; Anderson, Linda; Bekoff, Marc