Photography, History and Whatever Else Strikes my Fancy.
The Columbia Viking Desk Encyclopedia, Third Edition
Volume Two - Laval, F. X. de–Zworykin
edited by Columbia Encyclopedia editors, Columbia University, 1953, 1960, 1968
William Bridgewater, editor-in-chief
Viking Press, US
Published in Candada by MacMillan Company, CA, 1968
printed in US