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- Ultrasonic waves -- Industrial applications1
- Unions1
- Unit Plan1
- United States. Army -- Handbooks, manuals, etc1
- Units of Study7
- Unno, Kiyoshi, 1884-19661
- Untermyer, Irwin -- Art collections -- Catalogs1
- Uozumi, Iraku, 1886-19641
- Usedom Island (Germany) -- Antiquities1
- Utah1
- Uzbekistan -- Antiquities1
- Uzbekistan -- Bukhoro1