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[Washington, D.C.] : Office of Surface Mining Reclamation and Enforcement, Department of the Interior
200-
United States. Office of Surface Mining Reclamation and Enforcement, author.
[Washington, D.C.] : Office of Surface Mining Reclamation and Enforcement, Department of the Interior
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United States. Office of Surface Mining Reclamation and Enforcement, author.
[Reston, VA] : U.S. Department of the Interior, U.S. Geological Survey
20--
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