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Subjects
- USSR1
- Ultraviolet Rays1
- Unconsciousness1
- United States699
- United States -- epidemiology9
- United States -- ethnology2
- United States Government Agencies15
- United States Government Agencies -- legislation & jurisprudence1
- United States Government Agencies -- organization & administration10
- United States Marine Hospital at Boston.1
- United States Maritime Service.1
- United States Military Academy. Medical Department.1
- United States Naval Hospital (Mare Island, Calif.). Artificial Limb Department.1
- United States.2
- United States. Air Force Medical Service.1
- United States. Air Force.1
- United States. Army2
- United States. Army Epidemiological Board.1
- United States. Army Epidemiological Board. Commission on Immunization.1
- United States. Army Ground Forces. Medical Section. Preventive Medical Division.1