| Y 3.Uk 7 | Commission on the Ukraine Famine |
| Y 3.Un 2 | National Commission on Unemployment Compensation (1976- 1980) |
| Y 3.Un 3 | United States Constitutional Sesquicentennial Commission (1935- 1941) |
| Y 3.Un 3/2 | U.S. Study Commission on Neches, Trinity, Brazos, and San Jacinto River Basins and Intervening Areas (1958-1962) |
| Y 3.Un 3/3 | U.S.-FAO Interagency Committee (1958) |
| Y 3.Un 3/4 | U.S. Study Commission on the Savannah, Altamaha, Saint Marys, Apalachicola-Chattahoochee, and Perdido-Escambia River Basins and Intervening Areas (1958-1963) |
| Y 3.Un 3/5 | United States-Puerto Rico Commission on Status of Puerto Rico (1964) |
| Y 3.Up 6 | Upper Great Lakes Regional Commission (1967-1981) |
| Y 3.Up 6/4 | Upper Colorado River Commission |
