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- United States. General Accounting Office342
- United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response312
- United States. Environmental Protection Agency204
- United States192
- SpringerLink (Online service)170
- Library of Congress. Congressional Research Service142
- United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee88
- United States. Environmental Protection Agency. Technology Innovation Office88
- Risk Reduction Engineering Laboratory (U.S.)84
- United States. Environmental Protection Agency. Office of Emergency and Remedial Response81
- Geological Survey (U.S.)71
- ebrary, Inc66
- United States. Environmental Protection Agency. Office of Research and Development62
- United States. Environmental Protection Agency. Office of the Inspector General62
- United States. Government Accountability Office62
- United States. Congress. Senate. Committee on Environment and Public Works60
- United States. Congress. Office of Technology Assessment56
- Geological Survey (U.S.), issuing body53
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Transportation and Hazardous Materials51
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Commerce, Transportation, and Tourism48