000 00347nam a2200145Ia 4500
020 _a9780602575885
082 _bT-1082
_a510
100 _a"Merttens,Ruth"
245 0 _aAbacus evolve Textbook 1 (6)
260 _b,Pearson Education
_auk
_c2007
300 _a80
944 _cTB
999 _c677032
_d677032