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Naval Intelligence Manuals (ONI series).
During the pre-war and early-war period, the Office of Naval Intelligence issued numerous recognition and briefing manuals on allied, neutral, and enemy ships and aircraft. These manuals all carried the designation "ONI" or "O.N.I." plus a set of numbers (or number/letter combinations) to identify the manual content. The navy did not make any distiction between "ONI" (without the periods) or "O.N.I." (with the periods) - they were used interchangeably.
In mid-1942 the Office of Naval Intelligence became the Department of Naval Intelligence, but the name change did not effect the way that the manuals were designated.
ONI 41: Japanese warships (surface views)
ONI 41-42 Series: Japanese Naval Vessels (1945)
ONI 200-A: Aerial Views of United States Naval Vessels (1942)
ONI 201 Series: Warships fo the British Commonwealth (1944)
ONI 205: Russian/Soviet Naval Vessels
ONI 208-C: Carribean Small Craft
ONI 209: Merchant Ship Recognition (1943)
ONI 220: Axis Submarines
ONI 222: Statistical Data on Axis Navies
ONI 222-US: The US Navy
ONI 223-K: Warships in Code
ONI 224-G: German Warship Master Model Drawings (1943)
ONI 229: Japanese Merchant Shipping Tonnage and Identification
ONI 235: Soviet/Russian Aircraft
SHIPS-2: US Ship Camouflage Instructions (1942)
SHIPS-2: US Ship Camouflage Instructions (1943)
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