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- Ordnance Bureau (Navy)94
- Ordnance Corps (Army)407
- Ordnance Department5,486
- Ordnance Department (War Department)100
- Ordnance Dept.2
- Ordnance Office54
- Ordnance and Ammunition, Select Committee on Investigation of1
- Ordnance and Fortification Board38
- Ordnance and Fortification Board (War Department)1
- Ordnance and Fortification, Board of3
- Ordnance, Bureau of8
- Organization of Executive Branch of the Government Commission8
- Organization of Executive Branch of the Government Commission [1953-55]34
- Organization of the Government for Conduct of Foreign Policy Commission1
- Orientalia Division11
- Ornithology and Mammalogy Division5
- Osumi Group1
- Outdoor Recreation Bureau175
- Outdoor Recreation Resources Review Commission34
- Ozarks Regional Commission8