00362nam a2200109 a 450000500170000008200170001710000210003424500740005526000480012930000250017750000500020220251203090505.0  a577.094bCRO  aCrosby, Alfred W  aEcological imperialism:bthe biological expansion of Europe, 900-1900  aCambridgebCambridge University Pressc1986  axiv,368p.c23 cmbPB  aincludes bibliographical references and index