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- United States. General Accounting Office27
- United States. Congress. Senate. Committee on Environment and Public Works25
- United States. Environmental Protection Agency24
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Human Rights and International Organizations9
- United States8
- United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee8
- United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Technology, Environment, and Aviation8
- United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Protection8
- Illinois. Environmental Protection Agency7
- Krohe, James7
- United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Oceanography7
- United States. Environmental Protection Agency. Office of Research and Development7
- Council on Environmental Quality (U.S.)6
- SpringerLink (Online service)6
- United States. Bureau of Land Management6
- United States. Congress. House. Committee on Resources5
- United States. Congress. House. Committee on Science and Technology. Subcommittee on Natural Resources, Agriculture Research, and Environment5
- United States. Congress. House. Committee on Science and Technology. Subcommittee on the Environment and the Atmosphere5
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Water Resources and Environment5
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Science, Technology, and Space5