pullen, Keats A. Design of communication systems / Keats A. pullen - New York : Hayden Book, c1963. - vii,107 p. : ISBN: LCCN: Subjects--Topical Terms: CommunicationCommunication systems LC Class. No.: TK5101 / .P82 1963 Dewey Class. No.: 620.0042 / P982d