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Subjects
- United States2
- African Americans1
- Attitude1
- Blood Specimen Collection1
- Disabled Children -- history1
- Epidemiologic Studies1
- Expeditions1
- Fund Raising1
- History, 20th Century1
- Neoplasms -- epidemiology1
- Neoplasms -- ethnology1
- Social Conditions -- history1
- Social Perception1
- Sudan1
- Yellow Fever -- epidemiology1
- Yellow Fever -- transmission1