Siebenthal, C. E. (Claude Ellsworth), 1869-1930.
Washington, D.C. : U.S. Dept. of the Interior, United States Geological Survey : U.S. G.P.O., 1916.
1916
Siebenthal, C. E. (Claude Ellsworth), 1869-1930.
Washington, D.C. : U.S. Dept. of the Interior, United States Geological Survey : U.S. G.P.O., 1916.
1916