00278nam a2200109Ia 450000500170000000800410001708200150005810000190007324500330009226000350012530000080016020260224040844.0260224s9999||||xx |||||||||||||| ||und||  a614.17 PUR  aPurdom, P.W.   0aEcosystems and human affairs  aColumbus, Ohio : Merrillc1980  a404