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century (1 ed.). Santa Barbara, Calif.: ABC-CLIO. pp. 471–473. ISBN 978-1-85109-737-1. "RAF - History - 90 Signals Unit Historical Information". www.raf...13 KB (1,066 words) - 23:07, 25 March 2023- Military communications: from ancient times to the 21st century, p. 27, 2008 ISBN 9781851097371 Andrew White, Military Signal Corp Manual, 1918 v t e...1 KB (139 words) - 21:44, 10 November 2018
Communications: From Ancient Times to the 21st Century. ABC-Clio. p. 399. ISBN 978-1-85109-737-1. Haigh, Thomas; Ceruzzi, Paul E. (14 September 2021). A New History...83 KB (9,860 words) - 15:35, 1 May 2024
