Foshag, William F. (William Frederick), 1894-1956, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1956.
1956
Foshag, William F. (William Frederick), 1894-1956, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1942.
1942