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Railway
Artillery: A Report on the Characteristics, Scope of Utility, Etc., of Railway Artillery, Volume I, page 335 by Harry W Miller, United States Army Ordnance Department. Washington, Government Print Office, 1921.
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Photograph of US 14-inch 50 cal gun on Mk I carriage at maximum elevation. 5 of these were in action in France in 1918 in the last 3 months of World War I, crewed by the US Navy.
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