000 00282nam a22000977a 4500
082 _a507
_bHEI.M
100 _aHeiss, Elwood D
245 _aModern science teaching:
_cHeiss, Elwood D: Obourn, Ellsworth S; and Hoffman, Charles W
260 _aNew York:
_bMacmillan,
_c1957
942 _cBK
999 _c499782
_d499782