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020 _a471042498
082 _a592
_bPEN
_223
100 _aPENNAK, Robert W.
245 _aFresh-Water invertebrates of the United stated
_c/by Robert W.Pennak
250 _a2nd ed.
260 _aNew York
_bA Wiley-Interscience pub.
_c1978
300 _axv, 803 p.
500 _aIncludes appendix, references and index.
650 _aInvertebrates
942 _cS