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041 _aeng
082 _a503
_bSCI
100 _aScience And Invention Vol 21
245 _aScience And Invention Vol 21
_cby Science And Invention Vol 21
260 _aAmerica
_bH.S.Stuttman Inc.
_c1987
300 _a2928p.
650 _aScience
942 _cBK
999 _c13798
_d13798