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MARTIN LANGER, 2919-E N. Military Trail, West Palm Beach, FL 33409. Scholarly books - first editions - gay and lesbian literature. Write: martin at InvisibleCities dot com, or call him at: (561) 346-2002. 

Gregg, W David. ANALOG AND DIGITAL COMMUNICATION: Concepts, Systems, Applications & Services. NY: Wiley, 1977. 1st printing. ~ 603 pages. Hardcover (ISBN 0-471-32661-5). Near fine; in very good dust jacket.
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