Author
Georgia
5 results
Illinois
5 results
Indiana
5 results
Kentucky
5 results
Love, S. K. (Samuel Kenneth), 1903-1995
5 results
Minnesota
5 results
New York (State)
5 results
North Carolina
5 results
Ohio
5 results
Pennsylvania
5 results
West Virginia
5 results
Alabama
2 results
Michigan
2 results
Tennessee
2 results
Wisconsin
2 results
Geological Survey (U.S.)
1 results
Koester, Harry E.
1 results
Maryland
1 results
Miller, D. R.
1 results
Pennsylvania. Department of Environmental Resources
1 results
Virginia
1 results