00399nam a2200169Ia 4500008004100000020001500041082001600056100001900072245003300091250000600124260002300130300000800153650001400161650002000175653001200195653002200207170901s1981    xx            000 0 und d  a0713163585  a333.7bS45E  aSimmons, I. G. 0aEcology of Natural Resources  a2  aLondonbELBSc1981  a438  aEconomics  aSocial sciences  aEcology  aNatural resources