000 00338nam a2200145Ia 4500
020 _a1857586018
082 _b86-T
_a001.642
100 _a"Heathcote,P M"
245 2 _aA Leveling Computing
260 _bLetts Educational
_aUK
_c1997
300 _a244
944 _cTB
999 _c751635
_d751635