Authors: Ro
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- Powell, William Robert 1876- 325 downloads
- Rowe, Richard 1828-1879 323 downloads
- Roberts, Scott - 323 downloads
- Pinto da Rocha -1930 322 downloads
- Root, Riley 1795-1870 321 downloads
- Ronner, Alfred - 321 downloads
- Lyman, Richard Roswell 1870-1963 321 downloads
- Robinson, Hilda K. - 320 downloads
- Rosenhagen, Hans 1858-1943 319 downloads
- Roger, James Cruikshank 1820-1899 319 downloads
- Hutchins, Roy - 317 downloads
- Martin, Robert J. - 317 downloads
- Lucia, Rose - 317 downloads
- Cowdin, Robert 1805-1874 316 downloads
- Locher, Robert Evans 1888-1956 316 downloads
- Gorell, Ronald Gorell Barnes, Baron 1884-1963 316 downloads
- Rosario, Pasquale - 315 downloads
- Cox, Arthur Jean 1929-2016 315 downloads
- Rotch, Benjamin 1793-1854 314 downloads
- Roslin-Kalliola, Matilda 1837-1923 313 downloads
- Mayreder, Rosa 1858-1938 312 downloads
- Rohner, Gerold K. - 312 downloads
- Rol, C. (Cornelis) 1877-1963 312 downloads
- Rudolph, R. J. W. (Roelof Jan Willem) 1862-1914 312 downloads
- Rossiter, Charles 1827- 311 downloads