Washington: U.S. Geological Survey, 1883.

scholarly article by J.M. Boutwell published in January 1905

scientific article published in 1904

scientific article

scholarly article

New York: Wiley, 1894]

Washington [D.C.]: United States Geological Survey, 1886

scholarly article by Samuel Franklin Emmons published in January 1927

Washington,: Govt. Print. Off., 1896.

article by Samuel Franklin Emmons published 1883 in U.S. Geological Survey Bulletin

scholarly article

By: United States Geological Exploration of the Fortieth Parallel - Bien, Julius, - Eaton, Daniel Cady, - Emmons, Samuel Franklin, - Hague, A. (Arnold), - Hague, James D. (James Duncan), - Hall, James, - King, Clarence, - Meek, F. B. (Fielding B

scholarly article

article published in 1907