00387nam a2200145Ia 4500008004100000020001500041082001600056100002400072245004000096260004500136300000800181650002000189650001400209653001800223170901s1973    xx            000 0 und d  a0070685754  a301.3bW24P  aWatt, Kenneth E. F. 0aPrinciples of Environmental Science  aNew YorkbMcGraw-Hill Book Companyc1973  a319  aSocial sciences  aSociology  aHuman ecology