BL 12-inch railway gun (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "BL 12-inch railway gun" in English language version.

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eugeneleeslover.com

Miller 1921, p. 154. Miller, Harry W. (1921). Railway Artillery: A Report on the Characteristics, Scope of Utility, Etc., of Railway Artillery, Volume II (PDF). United States Army Ordnance Department. Washington: Government Print Office. pp. 146–155 – via Gene Lover's US Navy Pages.
Miller 1921, p. 149. Miller, Harry W. (1921). Railway Artillery: A Report on the Characteristics, Scope of Utility, Etc., of Railway Artillery, Volume II (PDF). United States Army Ordnance Department. Washington: Government Print Office. pp. 146–155 – via Gene Lover's US Navy Pages.
Miller 1921, p. 155. Miller, Harry W. (1921). Railway Artillery: A Report on the Characteristics, Scope of Utility, Etc., of Railway Artillery, Volume II (PDF). United States Army Ordnance Department. Washington: Government Print Office. pp. 146–155 – via Gene Lover's US Navy Pages.

"British 12"/40 (30.5 cm) Mark IX". NavWeaps. Tony DiGiulian. 29 February 2020.