Encyclopedias, Almanacs, Transcripts, and Maps
- Rock-Crawlers: Grylloblattodea
- Rocketing into Space: The Beginnings of the Space Age
- Rockets and Missiles
- Rockets and Missiles
- Rockets and Missiles
- Rodents: Rodentia
- Rodhe, Gosta (1912-)
- Rodney Robert Porter
- Rodrigo de Bastidas
- Roerich, Helena (1879-1949)
- Roessling, Bernhardt Emil (1892-1961)
- Rofé, (Fevzi) Husein (1922-)
- Roger Bacon
- Roger Cecil Burgus
- Roger Charles Louis Guillemin
- Roger Cotes
- Roger II of Sicily
- Roger of Salerno
- Roger Randall Dougan Revelle
- Roger Sperry