000 00331nam a2200145Ia 4500
020 _a9780602575793
082 _bL 1876
_a510
100 _a"RUTH MERTTENS"
245 0 _aAbacus evolve textbook 1 5
260 _bGINN
_aUK
_c2007
300 _a80
944 _cTR
999 _c558628
_d558628