Authors: R.
- Power, R. A. (Richard Anderson) 1888-1974
- Praeger, R. Lloyd (Robert Lloyd) 1865-1953
- Prescott, Della R. -
- Preston, R. M. P. (Richard Martin Peter) 1884-1965
- Prince, Val R. -
- Pritchett, R. T. (Robert Taylor) 1828-1907
- Procter, H. R. (Henry Richardson) 1848-1927
- Proctor, Richard A. (Richard Anthony) 1837-1888
- Pughe, G. R. G. (George Richard Gould) -
- Punnett, Reginald Crundall 1875-1967
- Punshon, E. R. (Ernest Robertson) 1872-1956
- Putnam, G. R. (George Rockwell) 1865-
- Quick, Robert Hebert 1831-1891
- Ragan, Robert A. -
- Rait, Robert S. (Robert Sangster) 1874-1936
- Ralston, William Ralston Shedden 1828-1889
- Ramón y Cajal, Santiago 1852-1934
- Ramsay, Rina -
- Ramstedt, Alexander 1848-1889
- Randolph, Vance 1892-1980
- Rankaves, Alexandros Rizos 1809-1892
- Rankin, R. C. (Richard C.) -
- Ransom, Reverdy C. (Reverdy Cassius) 1861-1959
- Raphael, John R. -
- Rapin, René 1621-1687
Sort By: