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020 _a0-582-31037-7
041 _aEng
050 _aQH 308 .7 .B57
100 _aMAWBY, P.J.
245 _cP.J. Mawby
_cM.B.V. Roberts
_aBiology 11-13
260 _aEssex
_c1983
_bLongman
300 _a291P
440 _aLongman Science 11-13
550 _aTangaza
650 _aBiology
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