Dictionaries, Thesauruses, Pictures, and Press Releases
- Roesel Von Rosenhof, August Johann
- Roger of Hereford
- Rogers, Henry Darwin
- Rohn, Karl
- Rolando, Luigi
- Rolfinck, Guerner
- roll along
- roll-type uranium ore
- Rolle, Michel
- rollers
- Rolleston, George
- Rollet, Joseph-Pierre-Martin
- rollover anticline
- Romanes, George John
- Romé De L
- Romer, Eugeniusz Mikolaj
- Romneya
- Rondelet, Guillaume
- ronquil
- Rood, Ogden Nicholas