Radio Wave Propagation: (Hf Bands) (Radio amateur's guide)
by F.C. Judd
ISBN 13: 9780434909261
Format: Hardcover (154 pages) Publisher: Butterworth-Heinemann Ltd Published: 09 Feb 1987
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Amateur Radio (Questions & Answers S.)
ISBN 13: 9780408004398
Format: Paperback (120 pages) Publisher: Newnes (an imprint of Butterworth-Heinemann Ltd ) Published: 01 May 1980