Stone, Ralph Walter (1876-1964) Stany Zjednoczone. Geological Survey
Schrader, Frank Charles (1860-1944) Stone, Ralph Walter (1876-1964) Sanford, Samuel (1865-1927) United States of America. Geological Survey.
Lee, Willis Thomas (1864-1926) Stone, Ralph Walter (1876-1964) Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.