  1997 - Internet Telephony for Dummies (Paperback) → Paperback ISBN-13: 9780764501746 ISBN-10: 0764501747 Genres: Computers & Technology, Engineering & Transportation ?  1990 - Long Distance Services a Buyer's Guide [Artech House Telecommunications Library] (Hardcover) ISBN-13: 9780890064399 ISBN-10: 0890064393 ?  Internet Telephony for Dummies (Paperback) → Paperback ISBN-13: 9780764500190 ISBN-10: 0764500198 Genre: Computers & Technology ?  Virtual Networks a Buyer's Guide [Artech House Telecommunications Library] (Hardcover) ISBN-13: 9780890064115 ISBN-10: 0890064113 Genres: Computers & Technology, Science & Math ? |
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