Roddy, Dennis creator Coolen, John Reston, Va Reston Pub. Co. c1981 2nd. ed. xii, 628 p. : ill. ; 25 cm. Part-1: Communications Fundamentals (Page-1), Part-2: Electronic Communications Circuits (Page-137), Part-3: Modulation of Signals (Page-239), Part-4: Transmission and Radiation of Signals (Page-367), Part-5: Communication Systems (Page-507). Dennis Roddy, John Coolen. Electronics Telecommunication 621.38,ROD 0835916316 80013291 20221117122029.0