| Operating systems (Computers) Matches 16 items |
| Operating systems (Computers) -- History -- 20th century. Matches 1 item |
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Operating under the influence of alcohol (Drunk driving) SEE: Drunk driving Matches 1 item
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Operating while under the influence. SEE: Drunk driving Matches 1 item
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| Operation Albion, 1917. Matches 1 item |
| Operation Anaconda, 2002. Matches 2 items |
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Operation audits. SEE: Management audit Matches 3 items
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Operation Barbarossa, 1941. SEE: World War, 1939-1945 -- Campaigns -- Eastern Front Matches 34 items
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Operation Cast Lead, 2008-2009 -- Personal narratives. SEE: Gaza War, 2008-2009 -- Personal narratives. Matches 1 item
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Operation Chromite, 1950. SEE: Inchon Landing, Inch‘on, Korea, 1950 Matches 1 item
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