Authors: Ro
- Slocum, Rob R. (Rob Roy) 1883-1944 1 book
- Reading, Robert William - 1 book
- Rau, Roscoe R. - 1 book
- Rosny, Lucien de 1810-1871 1 book
- Rogers, Karl - 1 book
- Shoppell, R. W. (Robert W.) - 1 book
- Robinson, William Laughlin 1933- 1 book
- Rohan, J. V. - 1 book
- Young, Rosalind Amelia 1853-1924 1 book
- Rose, Achilles 1839-1916 1 book
- Pietrocòla-Rossetti, T. (Teodorico) - 1 book
- Roke, G. D. - 1 book
- Rothamsted Experimental Station - 1 book
- Smith, William Robert Lee - 1 book
- Rothe, Rudolf 1873-1942 1 book
- Armitage, Robert B. - 1 book
- Gifford-Bennet, Robert Ottiwell 1834-1902 1 book
- Díaz Romero, B. (Belisario) 1870-1940 1 book
- Sketchley, R. E. D. (Rose Esther Dorothea) 1875- 1 book
- Cole, Rossetter G. (Rossetter Gleason) 1866-1952 1 book
- Roberts, Margaret 1833-1919 1 book
- Ross, P. T. - 1 book
- Stearns, J. N. (John Newton) 1829-1895 1 book
- Goodyear, R. A. H. (Robert Arthur Hanson) - 1 book
- Crandell, Dwight R. (Dwight Raymond) 1923-2009 1 book
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