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BOSANQUET, H.T.A. and Lieut.-Commander G.R.C. Campbell. Royal Naval Air Service. Navigation, Magnetism and Deviation of the Compass. A Manual for the use of Aerial Navigators. 1917.
NP: Air Department, Admiralty, 1917. Tall 8vo., orig. cloth backed boards, 98, (3)pp. “For Official Use Only” is printed on the upper board. Very good.