Risdon, P. J. ; Wireless. Introduction by J. A. Fleming. Ward, Lock & Co. , London/Melbourne, no date. Ca. 1920.
Thick 8o in publishers´ hardbound, olive-green binding with black lettering. Minimal wear to binding. Fly-leaves mildly foxed, else fine. Illustrated with 44 black and white photographic plates and many figures.384 pages.