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Subjects
- Hookworm Infections -- prevention & control[remove]6
- China3
- Health Education3
- Community Health Services2
- Hookworm Infections -- therapy2
- Sanitation2
- Southeastern United States2
- Central America1
- Egypt1
- Foundations1
- Guyana1
- Rockefeller Foundation. International Health Commission1
- Rockefeller Sanitary Commission for the Eradication of Hookworm Disease.1
- Sanitation -- statistics & numerical data1