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Subjects
- United States15
- United States -- epidemiology2
- United States. Army1
- United States. Army of the Potomac1
- United States. Army of the Potomac. Ambulance Corps1
- United States. Army. Surgeon General's Office. Nursing Division1
- United States. Marine Hospital (Staten Island, New York, N.Y.)1
- Urinalysis1
- Urine1
- Uruguay2