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- Roentgen 1
- Roentgen - Rays 1
- Roentgen Rays 2
- Roentgen Therapy 3
- Roentgen-Diagnosis 1
- Roentgen-Ray Machines 1
- Roentgenographic Measurement 1
- Roentgenographic Measurement | 1
- Roentgenology 3
- Roentgenology, Diagnosis 1
- Roman Astronomy & Astrology 1
- Ronent Genology, Diagnosis 1
- Rubella 1
- Rudiments of Haematology 1
- Rules-Cataloguing 2
- Russian - English - Dictionary 1
- Sacred - Diseases 1
- Saliva 1
- Salivary Gland Tumors 1
- Salivary Glands - Malignant Tumors 1