00721nam0-22002771i-450-99000028298040332120001010000028298FED01000028298(Aleph)000028298FED0100002829820001010d--------km-y0itay50------baitay-------001yyData Comminicationsa users guideKenneth ShermanRestonReston Publishing Company Inc.1981XIX,348 p. ill. 24 cm001Sherman,KennethITUNINARICAUNIMARCBK99000028298040332104 045-74CIDINCHDINCHUNINAING01