000 00263nam a22001217a 4500
020 _a9780602575816
040 _cPK-LaCSN
082 _aT 510
_bMER-A
100 _a"Merttens, Ruth"
245 _aAbacus evolve text Book 3 (5)
942 _2ddc
_cTB
999 _c825432
_d825409