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Author/Creator
- Geological Survey (U.S.)6
- Ryder, Robert T.2
- Aleinikoff, John Nicholas1
- Bohannon, Robert G.1
- Bryant, Bruce, 1930-1
- Denver Science Publishing Network1
- Dorais, Michael J.1
- Dumonceaux, Gayle M.1
- Johnson, Ronald C. (Ronald Carl), 1950-1
- Massachusetts. Geological Survey1
- Premo, Wayne R.1
- Ruleman, C. A. (Chester Allan)1
- Shroba, R. R.1
- Swezey, C. (Christopher)1
- Trippi, Michael H.1
- United States. National Park Service1
- Van Sistine, Paco R.1
- Walsh, Gregory J.1
- Weary, David J.1