000 00366nam a2200145Ia 4500
020 _a0809483033
082 _b575
_a510
100 _a"The Childrens treasury of knowledge "
245 0 _aMathematics and computers
260 _bTime Life Books
_aHong Kong
_c2011
300 _a112
944 _cBK
999 _c667576
_d667576