000 00314 a2200109 4500
008 181231b xxu||||| |||| 00|
100 _aWilliam A. Andrews
245 _aA guide to the study of freshwater ecology /
_cWilliam A. Andrews
260 _b Prentice Hall canada Ltd.
_c1972
300 _a182p.
942 _2ddc
_cBK
999 _c7710
_d7710