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Author/Creator
- United States311
- United States. Congress. House254
- United States. Bureau of Mines142
- Geological Survey (U.S.)124
- Geological Survey (U.S.), issuing body111
- United States. Geological Survey108
- United States. Mine Safety and Health Administration106
- United States. Congress. Senate100
- United States. Bureau of Land Management94
- United States. Office of Surface Mining Reclamation and Enforcement79
- United States. Department of the Interior73
- Library of Congress. Congressional Research Service69
- International Labour Office67
- National Mine Health and Safety Academy43
- United States. General Accounting Office40
- Project Muse30
- Illinois State Geological Survey29
- United States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Labor26
- Great Britain25
- ebrary, Inc25