- United States. Bureau of Public Roads (14)
- Hassan, A. F (3)
- Illinois State Geological Survey (3)
- Leith, C. K. (Charles Kenneth), 1875-1956 (3)
- Leverett, Frank, 1859-1943 (3)
- Renshawe, J. H. (John Henry), 1852- (3)
- Van Hise, Charles Richard, 1857-1918 (3)
- Bryan, Kirk, 1888-1950 (2)
- Geological Survey of Alabama (2)
- Hassan, A. F. (2)
- Alden, William C. (William Clinton), 1871-1959 (1)
- Allen, R. C (1)
- Appalachian Mountain Club (1)
- Barnard, E. C. (Edward Chester), 1863-1921 (1)
- Darton, Nelson Horatio, 1865-1948 (1)
- Fisher, C. A (1)
- Gannett, Henry, 1846-1914 (1)
- Gilbert, Grove Karl, 1843-1918 (1)
- Goldbaum, David, 1858-1930 (1)
- Harrison, R. L. (1)
