Authors: Robert
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- Chapman, Robert Cleaver 1803-1902 328 downloads
- Engels, Robert 1866-1926 326 downloads
- Roberts, Scott - 326 downloads
- LeFevre, Robert 1911-1986 325 downloads
- Ragan, Robert A. - 325 downloads
- Locher, Robert Evans 1888-1956 324 downloads
- Cooper, Robert A. - 323 downloads
- Macfie, R. A. Scott (Robert Andrew Scott) 1868-1935 323 downloads
- Shewell, Livingston Robert 1833-1904 320 downloads
- Bell, Robert 1766-1826 319 downloads
- Lory, Robert 1936- 317 downloads
- Reading, Robert William - 316 downloads
- Martin, Robert J. - 316 downloads
- McElroy, Robert McNutt 1872-1959 303 downloads
- Bayley, Emilius, Sir 1823-1917 302 downloads
- Douglas-Lithgow, R. A. (Robert Alexander) 1846-1917 301 downloads
- Watt, Robert -1794 299 downloads
- Redaelli, Carlo - 299 downloads
- Powell, William Robert 1876- 294 downloads
- Pistorius, Fritz 1864-1932 287 downloads
- Rohrer, Robert H. 1946- 285 downloads
- Roberts, Alexander, Baron von 1845-1896 283 downloads
- Jones, Robert Webster 1874-1947 283 downloads
- Robertson, Lida B. - 281 downloads
- Hartmann, Eduard von 1842-1906 281 downloads