  1998 - Isdn Concepts Facilities and Services [Mcgraw-Hill Computer Communications Series] (Paperback) ISBN-13: 9780070344372 ISBN-10: 007034437X Genres: Computers & Technology, Reference, By Publisher ?  Isdn Concepts Facilities and Services [Mcgraw-Hill Series on Computer Communications] (Hardcover) → Hardcover ISBN-13: 9780070342491 ISBN-10: 0070342490 ? |
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