000 00351nam a2200145Ia 4500
020 _a8172451113
082 _b1337
_a500
100 _a"Brecher, Erwin"
245 0 _aChallenging Science Puzzles.
260 _bgoodwill publishing
_aNew Delhi
_c1997
300 _a96
944 _cBK
999 _c204135
_d204135