000 00301nam a2200133Ia 4500
008 220928s9999 xx 000 0 und d
082 _bUNE
100 _aUNESCO
245 0 _aSOURCE BOOK FOR SCIENCE TEACHING
260 _bUNESCO, PARIS
_c1966
300 _a250
650 _aGeneral
942 _cBK
999 _c207251
_d207251