Names
- Ruthven, Alexander Grant, 1882-19711
- Shields, Edmund Claude, 1871-1947.1
- Shorts, Robert P. (Robert Perry), 1879-1975.1
- Shull, Aaron Franklin (1881-1961)1
- Shull, Aaron Franklin, 1881-1961.1
- Sigler, Kim, 1894-1
- Sleeper, Albert E., 1862-1934.1
- Sloan, Alfred P. (Alfred Pritchard), 1875-1966.1
- Smith, Harold Dewey, 1898-1947.1
- Smith, John Walter, 1845-1925.1
- Smith, Richard Root, 1869-1940.1
- Smith, William Alden (1859-1932)1
- Sproul, Robert Gordon, 1891-1975.1
- St. Laurent, Louis S. (Louis Stephen), 1882-1973.1
- St. Mary's Canal Mineral Land Company.1
- Stason, E. Blythe (Edwin Blythe), 1891-1972.1
- Stearns, Robert Lawrence, 1892-1
- Stejneger, Leonhard, 1851-1943.1
- Stimson, Henry L. (Henry Lewis), 1867-1950.1
- Stockard, Charles Rupert (1879-1939)1