Author
Geological Survey (U.S.),
5
Pipiringos, G. N. 1918-
4
Imlay, Ralph W. 1908-1989
3
Imlay, Ralph W. 1908-1989,
3
O'Sullivan, Robert Brett, 1923-
2
Baker, Arthur A. 1897-1996,
1
Carpenter, Kenneth, 1949-
1
Chure, Dan
1
Dane, C. H. 1900-1968,
1
Denver Museum of Natural History
1
Kirkland, James I.
1
Mari, David Lee, 1945-
1
Reeside, John B., Jr., 1889-1958,
1