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Author
- Geological Survey (U.S.) Minerals Information Team9
- National Atlas of the United States8
- Geological Survey (U.S.)5
- Platts2
- Arndt, Raymond E.1
- Bawiec, Walter J.1
- Beikman, Helen M.1
- Environmental Systems Research Institute, Inc. (ESRI)1
- Godt, Jonathan W.1
- King, Philip B.1
- Rawson, Peg1
- Schruben, Paul G.1
- United States. Bureau of Transportation Statistics1