000			00419pam a2200157a 44500
008			140414b1999 xxu||||| |||| 00| 0 eng d
082			_a005.71 _bHEL
100			_aHELD, GILBERT
245			_aUnderstanding Data Communications _c
250			_a6 Ed.
260			_aindianaplis _bNew riders _c1999
650			_a COMPUTER NETWORKS.
650			_aDATA TRANSMISSION SYSTEMS
690			_aCOMPUTER SCIENCE
906			_a18042
999			_c17443 _d17443