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- U karty mira1
- U.B.B.P. research series2
- U.B.B.P. research series ; no. 11
- U.S. Geological Survey circular1
- U.S. Geological Survey open-file report3
- U.S. Hydrographic Office. Pub1
- UICC technical report series1
- UNESCO/UNEP man and the biosphere programme, project 11. Integrated ecological studies of human settlements1
- UNISURV report S2
- USA-CERL manuscript1
- USA-CERL technical manuscript1
- USACERL ADP report2
- USAWC military studies program paper1
- USGS fact sheet1
- Umbrae codicum occidentalium1
- Understanding Japan2
- Understanding population trends and processes2
- Uni-Taschenbucher1
- Unibooks1
- United States exploring expedition1