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- Illinois State Geological Survey - 1847 downloads
- Scott, R. S. - 1845 downloads
- Lee, Robert E. (Robert Edward) 1807-1870 1844 downloads
- Lee, Robert E. (Robert Edward) 1843-1914 1844 downloads
- Barton, Ralph 1891-1931 1842 downloads
- Scott, Robert Falcon 1868-1912 1842 downloads
- Suarès, André 1868-1948 1841 downloads
- Dickson, Gordon R. 1923-2001 1837 downloads
- Baldridge, Cyrus Leroy 1889-1977 1837 downloads
- Repp, Ed Earl 1900-1979 1836 downloads
- Ramsay, William 1852-1916 1833 downloads
- Hovey, Richard 1864-1900 1832 downloads
- Reed, Thomas B. (Thomas Brackett) 1839-1902 1830 downloads
- Smith, T. Roger (Thomas Roger) 1830-1903 1827 downloads
- Rodd, Rennell 1858-1941 1824 downloads
- Roujon, Henry 1853-1914 1824 downloads
- Record, Samuel J. (Samuel James) 1881-1945 1822 downloads
- Rabot, Charles 1856-1944 1820 downloads
- Peyser, Ethel R. (Ethel Rose) 1887-1961 1818 downloads
- Bodmer, Rudolph J. (Rudolph John) 1872-1952 1817 downloads
- Reid, Stephen 1873-1948 1816 downloads
- Shaw, Edward R. (Edward Richard) 1855-1903 1809 downloads
- Peacock, Ralph 1868-1946 1805 downloads
- Rudder, Robert S. - 1804 downloads
- Rosendal, Mauno 1848-1917 1802 downloads