Information telecommunications :
Heldman, Robert K.
Information telecommunications : networks, products, [and] services / Robet K. Heldman. - San Francisco : McGraw-Hill, 1994. - 386 p. ; 24 cm.
0070280401
HE7631 / H45
Information telecommunications : networks, products, [and] services / Robet K. Heldman. - San Francisco : McGraw-Hill, 1994. - 386 p. ; 24 cm.
0070280401
HE7631 / H45