00275nam a2200085Ia 4500008004100000082002100041100001900062245008200081260002600163220204s9999    xx            000 0 und d  a681.32IBMbESS.4  aJack, Robert F 0aEssential guide to the library IBM PC. V 4. Data communications: Going online  aLondonbMecklerc1987