Template:UKProgGunMat1923
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Admiralty, Gunnery Branch. Progress in Gunnery Material, 1922 and 1923. (C.B. 1640) The National Archives. ADM 186/259.
Admiralty, Gunnery Branch. Progress in Gunnery Material, 1922 and 1923. (C.B. 1640) The National Archives. ADM 186/259.