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- USSR6
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- Ultrasonic Waves -- adverse effects4
- Ultrasonography1
- Ultraviolet Rays2
- Ultraviolet Rays -- adverse effects2
- Union Health Center (New York, N. Y.)1
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- United States335
- United States -- epidemiology2
- United States Air Force String Orchestra.1
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- United States Government Agencies -- history1
- United States Government Agencies -- organization & administration5
- United States Marine Hospital No. 66 (Carville, La.)1
- United States Military Academy. Medical Department1
- United States Naval Hospital (Mare Island, Calif.). Artificial Limb Department1
- United States Public Health Service30
- United States-Japan Cooperative Medical Science Program.1