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- United States[remove]29
- Public Health15
- Sanitation15
- Health Expenditures14
- Education, Nursing -- legislation & jurisprudence3
- Quarantine -- legislation & jurisprudence3
- Antitoxins2
- Ecuador2
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- Military Nursing -- legislation & jurisprudence2
- Military Personnel2
- Toxins, Biological2
- Venezuela2
- Viruses2
- World War II2
- Aircraft -- legislation & jurisprudence1
- Arsphenamine1
- Bolivia1
- Brazil1
- Colombia1