000			00317nam a2200133Ia 4500
008			160316s1971 xxu||||| |||| 00| 0 eng d
020			_a
100			_aD. Lack
245			_aEcological Isolation In Birds
250			_a1st
260			_aMASSACHUSETTS _bHARVARD UNIVERSITY PRESS _c1971
300			_a404
700			_a _a
999			_c12740 _d12740