00266    a2200097   4500082001700000100001900017245005200036260003100088300002400119650002500143  a005.756bTOW  aTownsend, Carl  aMastering dbase iii plusba srructured approach  aNew DelhibBPBc1987g1987  axviii, 341p.c21cm.  aRELATIONAL DATABASES