Author
Geological Survey (U.S.)
2
Bagg, Rufus M., 1869-
1
Butler, B. S. 1877-1960
1
Geological Survey (U.S.),
1
Hager, Michael W.
1
Hunt, Charles B. 1906-1997
1
Hunt, Charles B. 1906-1997,
1
Knepper, Daniel H.
1
Lee, Willis T. 1864-1926
1
Mendenhall, Walter C. 1871-1957
1
Schaller, Waldemar T. 1882-1967
1
Schultz, Alfred Reginald, 1876-
1