000 00362nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a9.78E+12
082 _a1
082 _b642 KE
100 _a"Kershner, Helene G."
245 0 _aIntroduction to Computer
260 _aCanada
260 _bD.C Heath and Company
260 _c1990
300 _a"xxv, 431"
999 _c32068
_d32068