000 00269nam a2200121Ia 4500
100 _aAsimov, Isaac
020 _a0 330 26249 1
942 _cBK
245 _aExtraterrestrial civilizations
260 _aPan Books Ltd, London
_c1981
082 _a523 Asi
300 _a316
999 _c15749
_d15749