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Author/Creator
- Geological Survey (U.S.)8
- Torres-Sierra, Heriberto2
- Bayamón (P.R.)1
- Bryce, Ben N.1
- Gamble, Charles R.1
- Garrett, Joanne M.1
- Gonzalez, Ralph1
- Harkness, R. E. (Russell Elmer)1
- Hejl, H. R.1
- Jennings, Marshall E.1
- Johnson, Karl G.1
- Laramie County (Wyo.)1
- Lewis, J. G. (James Grady), 1942-1
- Meyer, D. F.1
- Puerto Rico. Department of Natural and Environmental Resources1
- Ritz, George F.1
- Roeske, R. H.1
- Ryan, Gerald L.1
- Shelby County (Tenn.)1
- Slade, R. M.1