Acronym |
Definition |
| UMR-IWW | Upper Mississippi River- Illinois WaterWay |
| UMV | Upper Mantle Vessel |
| UMWA | United Mine Workers of America |
| UMWT | Upper Mon Water Trail |
| UNESCO | United Nations Educational, Scientific, and Cultural Organization |
| UOV | Upper Ohio Valley |
| UPRB | Upper Paraguay River Basin |
| UPT | Uniformitarian Plate Tectonics |
| URPG | Undergraduate Research in Petrology and Geochemistry |
| USA | United States of America |
| USB | Useless Steam Blowhole |
| USCGS | United States Coast and Geodetic Survey |
| USDW | Underground Source of Drinking Water |
| USDW(S} | underground source(s) of drinking water |
| USG | United States Gypsum |
| USGS | United States Geological Survey |
| USIGS | United States Imagery and Geospatial System |
| USLW | Upper Susquehanna- Lackawanna Watershed |
| USNK | Upper Snake River |
| USRB | Upper Snake River Basin |
| USRW | Upper Suwannee River Watershed |
| USTZ | Un- Supported Transition Zone |
| UTR | Un-Translated Region |
| UU | Undrain UnConsolidation Triaxial Test |
| UVO | Usu Volcano Observatory |
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