00277nam a2200109 a 450000500170000008200130001710000220003024500390005226000320009130000230012363000210014620251203090609.0  a004bSAN  aSanders, Donald H  aComputer concepts and applications  aNew YorkbMcGraw Hillc1987  a546 p.c22 cm.cPB  aComputer Science