Author/Creator
- Hartshorn, Joseph H. (Joseph Harold), 1922-1
- Howard, Alan D.1
- Huber, N. King (Norman King), 1926-1
- Indiana. Geological Survey1
- Iowa Geological Survey1
- Kansas Geological Survey1
- Luza, Kenneth V.1
- Manitoba. Department of Energy and Mines1
- Missouri. Division of Geology and Land Survey1
- North Dakota Geological Survey1
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Riehle, J. R.1
- South Dakota Geological Survey1
- Stine, Scott1
- Swinehart, James B.1
- University of California, Berkeley. Department of Geology and Geophysics1
- University of Massachusetts at Amherst. Department of Geology and Geography1
- University of Nebraska--Lincoln. Conservation and Survey Division1
- University of Virginia. Department of Environmental Sciences1
- Wahrhaftig, Clyde, 1919-19941