| Y 3.Ob 7 | Commission on Obscenity and Pornography (1967- 1970) |
| Y 3.Oc 1 | Occupational Safety and Health Review Commission (1970- ) |
| Y 3.Oc 1/2 | National Occupational Information Coordination Committee (1976-2000) |
| Y 3.Oc 2 | National Advisory Committee on Oceans and Atmosphere (1971-1986) |
| Y 3.Ol 1 | Old West Regional Action Planning Commission (1965- 1981) |
| Y 3.Or 3 | Commission on Organization of the Executive Branch of the Government (1947-1949) |
| Y 3.Or 3/2 | Commission on Organization of the Executive Branch of the Government (1953-1955) |
| Y 3.Ou 8 | Outdoor Recreation Resources Review Commission (1958-1962) |
| Y 3.Oz 1 | Ozarks Regional Commission (1966-1981) |
