Subjects
- United States2
- World War II2
- Africa, Northern1
- Air Pollution1
- Brazil1
- Budgets1
- Cause of Death1
- Chicago1
- Child Welfare1
- China1
- Cholera1
- Communicable Diseases -- epidemiology1
- Communicable Diseases -- mortality1
- Communicable Diseases -- transmission1
- DDT1
- Developing Countries1
- Disease Outbreaks1
- Disease Transmission, Infectious1
- Disinfection1
- Emigrants and Immigrants1