000 00310 a2200109 4500
008 190131b xxu||||| |||| 00| 0
100 _a Robert W. Pennak
245 _aFreshwater invertebrates of united states /
_c Robert W. Pennak
260 _aNwwew york
_bRonald Press
_c1953
300 _a769p.
942 _2ddc
_cBK
999 _c7963
_d7963