| I1 - I12 | Department of the Interior | |
| I16 | Office of Education - Vocational Education Division | |
| I17 | Geographical and Geological Survey of the Rocky Mountain Region | |
| I18 | Geographical and Geological Survey of the Territories | |
| I19 | Geological Survey | |
| I20 | Bureau of Indian Affairs | |
| I21 | General Land Office | |
| I24 | Bureau of Pensions | |
| I26 | Entomological Commission | |
| I27 | Bureau of Reclamation | |
| I28 | Bureau of Mines | |
| I29 | National Park Service | |
| I32 | Petroleum Administrative Board | |
| I39 | Office of Consumers' Counsel | |
| I40 | Housing Authority | |
| I49 | Fish and Wildlife Service | |
| I52 | War Relocation Authority | |
| I56 | Defense Electric Power Administration | |
