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Authors
- Ramón y Cajal, Santiago, 1852-1934 Author4
- Ramón y Cajal, Santiago, 1852-1934 author1
- Raulin, Joseph, 1708-1784 author1
- Ray, artist1
- Rāzī, Abū Bakr Muḥammad ibn Zakarīyā, 865?-925?, Author1
- Reisch, Gregor, -1525 author2
- Remi, Nicolas, 1530-1612, author1
- Ricettario Fiorentino. 1556.1
- Robertson, Abraham, author1
- Rokitansky, Karl, Freiherr von, 1804-1878, author2
- Rösslin, Eucharius, -1526 Author1
- Rösslin, Eucharius, -1526 author1
- Rösslin, Eucharius, -1547 author1
- Rueff, Jakob, ca.1500-1558, Author7
- Rueff, Jakob, ca.1500-1558, author2
- Ruffo, Giordano, 13th cent., author1
- Rush, Benjamin, 1746-1813 author1
- Russell, Andrew J., photographer7
- Ryff, Walther Hermann, -1548, author1