00444nam a2200157Ia 4500008004100000020001500041082001600056100002100072245006200093260005000155300000800205650002000213650001400233653001800247700002100265170901s1970    xx            000 0 und d  a0716706806  a301.3bE42P  aEhrlich, Paul R. 0aPopulation Resources EnvironmentbIssues in Human Ecology  aSan FranciscobW.H. Freeman and Companyc1970  a383  aSocial sciences  aSociology  aHuman ecology  aEhrlich, Anne H.