000 00302nam a2200121Ia 4500
008 240531s9999 xx 000 0 und d
020 _a9231016660
082 _a507 NEW
100 _aNULL
245 0 _aNew Unesco source book for science teaching.
260 _aLondon
_b Unesco
_c1973
942 _cANF
999 _c315591
_d315591