00293nam a2200097Ia 4500008004100000082001600041100003000057245002600087260007400113300000800187140113s9999    xx            000 0 und d  a620.9.8  L3  a"Hammond, A.L., et al�"  aEnergy and the future  a1973bAmerican Association for the advancement of sciencecWashington  a184