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024 _a55130
037 _cTextual
040 _aCRL
_cCRL
_beng
041 _2eng
_aeng
082 _aT:3:(A), H0
100 _aHeiss Elwood D
245 0 _cHeiss Elwood D
_aModern methods and materials for teaching science.
260 _c1940
650 _a TEACHING
_934578
650 _aEDUCATION
942 _hT:3:(A), H0
_cTEXL
_2cc
999 _c1049990
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