Author
Geological Survey (U.S.)
8
Kruger, C. L.
4
Michigan. Geological Survey Division
4
Geological Survey (U.S.),
3
Balsley, J. R.
2
Blank, H. Richard 1929-
2
James, H. L. 1912-2000
2
Philbin, P. W.
2
Vargo, Joseph L.
2
Wier, K. L. 1914-
2
Good, Stanley E., 1919-1949
1
Good, Stanley E., 1919-1949,
1
James, H. L. 1912-2000,
1
Mackin, J. Hoover 1905-1968
1
Mackin, J. Hoover 1905-1968,
1
Pettijohn, F. J. 1904-1999
1
Pettijohn, F. J. 1904-1999,
1
Smith, C. W. 1920-
1