000 00315nam a2200133Ia 4500
001 2792
008 220811s1957 ###||||g |||| ||spa d
082 _a575
_bM474
100 _aMayr, Ernst
_990947
245 4 _aThe Species Problem
264 _c1957
942 _cBK
_2ddc
035 _a575 -M474-The Species Problem-
999 _c70894
_d70894