| U of A (13) | U of C (5) | U of S (5) |
| Ukrainian (8) | Ukrainians (2) | ultraclean lab methods (1) |
| Unchaga (1) | undefined (1) | underdevelopment (1) |
| unemployment (1) | UNESCO's World Heritage Committee (1) | UNESCO. World Heritage Committee (1) |
| ungulates (4) | United Church (1) | United Nations (3) |
| United Nations General Assembly (1) | United States (1) | Univeristy of Iowa (1) |
| University of Alberta (2) | unmentionable (1) | unsaturated (1) |
| UofA (651) | UofC (156) | UofS (140) |
| upgraders (3) | upland sandpiper (1) | Upper Athabasca (2) |
| Upper Athabasca River Valley (1) | Upper Athabasca River Watershed (1) | Upper Athabasca Valley (2) |
| Upper Foothills (1) | Upper Peace River (1) | Upper Yukon (1) |
| upstream (1) | uranium (4) | uranium deposits (1) |
| urban (1) | urban development (2) | urban environment (1) |
| urban groundwater (1) | urban riparian settings (1) | urbanization (2) |
| Ursidae (14) | use (5) | uses (1) |
| utilization (1) | ||
