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- Rectosigmoidoscópico 1
- Red Cell 1
- Red Kidney Beans 1
- Regional medical programs -- Puerto Rico -- History 1
- Región oriental de Puerto Rico 1
- Release of Lepers 1
- Renal Hyperparathyroidism 1
- Report 1
- Report of the Commissioner of Health 5
- representaciones de la enfermedad--Puerto Rico--Siglo 18 1
- representaciones de la naturaleza--Puerto Rico--Siglo 18 1
- representaciones del trópico--Puerto Rico--Siglo 18 1
- Reproduction 1
- Republic of Santo Domingo 1
- República Dominicana 1
- Respiratory Disease 2
- Respiratory Trumpet 1
- Review 38
- Review of Research 2
- Review of Reviews 1