Authors: R.
- Chatburn, George R. 1863-1940 2021 downloads
- Hobson, R. L. (Robert Lockhart) 1872-1941 2000 downloads
- Willis, Robert 1799-1878 1999 downloads
- Procter, H. R. (Henry Richardson) 1848-1927 1986 downloads
- Dunn-Pattison, R. P. 1874-1916 1963 downloads
- Smith, T. R. (Thomas Robert) 1880-1942 1946 downloads
- Weldon, Walter Frank Raphael 1860-1906 1932 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 1929 downloads
- Delany, Martin Robison 1812-1885 1927 downloads
- Sandbach, William R. - 1926 downloads
- Carling, John R. - 1912 downloads
- Smith, Richard Rein 1930- 1912 downloads
- Coyle, Edward R. (Edward Royal) 1887-1939 1911 downloads
- Coleridge, Christabel R. (Christabel Rose) 1843-1921 1904 downloads
- Griswold, Rufus W. (Rufus Wilmot) 1815-1857 1904 downloads
- Moulton, Richard G. (Richard Green) 1849-1924 1901 downloads
- Spofford, Ainsworth Rand 1825-1908 1881 downloads
- Eucken, Rudolf 1846-1926 1873 downloads
- Wenckebach, L. W. R. (Ludwig Willem Reymert) 1860-1937 1868 downloads
- Peyser, Ethel R. (Ethel Rose) 1887-1961 1852 downloads
- Lee, Robert E. (Robert Edward) 1843-1914 1849 downloads
- Clephan, R. Coltman (Robert Coltman) 1839-1922 1848 downloads
- Eberle, Joseph 1926-2006 1843 downloads
- Preston, R. M. P. (Richard Martin Peter) 1884-1965 1810 downloads
- Scott, Robert Falcon 1868-1912 1793 downloads
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