00652nac a22001931u 4500 2001089583 0672322161 (alk. paper) 004.6 H4743 446 446 Held, Gilbert, Understanding data communications / Gilbert Held. 6th ed. Boston : Addison-Wesley, c2002. xv, 765 p. : ill. ; 23 cm. Data transmission systems. Computer networks. BB 004.6H4743 446 446 0 0 ddc 0 0 MAIN MAIN LOW 2016-05-06 purchase 70.00 0 004.6 HEL 000004179 2025-07-15 00:00:00 87.50 BB