Author
Geological Survey (U.S.),
2
Nichols, Thomas C.
2
White, Walter S. 1915-
2
Arnold, Ralph, 1875-1961
1
Becker, George F. 1847-1919
1
Dale, T. Nelson 1845-1937
1
Dale, T. Nelson 1845-1937,
1
Geological Survey (U.S.)
1
Goss, W. F. M. 1859-1928
1
Hillebrand, W. F. 1853-1925
1
Ransome, F. L. 1868-1935
1
Ray, Walter T.
1