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Subjects
- Fertility[remove]9
- Birth control4
- Population4
- Biology -- Research3
- Agriculture2
- Agronomy2
- Cell and biomolecular sciences2
- Diaries 2
- Economic development2
- Economics2
- Family planning2
- Federal government -- United States2
- Life sciences2
- Maternal health services2
- Overpopulation2
- Physiology2
- Sociology2
- Agricultural education1
- Animal breeding1
- Beans1