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- The Survey ; For sale by the USGS Information Services1
- U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services1
- U.S. Geological Survey1
- U.S. Geological Survey : U.S. Geological Survey, Information Services [distributor]1
- U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services1
- U.S. Geological Survey ; Information Services [distributor]1
- Università di Bologna, Dipartimento di Scienze della Terra e Geologico-Ambientali,S.E.L.C.A.1
- VSEGEI1
- Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension1
