00459nam a2200169Ia 4500008004100000020001500041082001700056100002100073245004200094260005100136300000800187650002000195650001400215653001800229700002100247700002100268170901s1973    xx            000 0 und d  a0716705958  a301.31bE42H  aEhrlich, Paul R. 0aHuman EcologybProblems and Solutions  aSan FranciscobW. H. Freeman and Companyc1973  a304  aSocial sciences  aSociology  aHuman ecology  aEhrlich, Anne H.  aHoldren, John P.