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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. 

Shanmugam, K Sam. DIGITAL AND ANALOG COMMUNICATION SYSTEMS. NY: Wiley, 1979. 1st printing. ~ 600 pages. Hardcover (ISBN 0-471-03090-2). Near fine; in very good, spine-faded dust jacket.
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