000 00393nam a2200157 a 4500
005 20151028162004.0
008 960221s1955 dcuabcdjdbkoqu001 0deng d
082 _a507
_bK2
100 _aUnesco
_927169
245 _a Unesco source book for science teaching
653 _aPure sciences
_aPure sciences
942 _cREF
942 _cREF
260 _aUNESCO
_bUNESCO
_c1956
003 ViArRB
999 _c73080
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