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Author/Creator
- Library of Congress. Congressional Research Service24
- SpringerLink (Online service)11
- Geological Survey (U.S.)10
- United States. Division of Water Supply and Pollution Control10
- Mason, William Pitt, 1853-19378
- United States. Public Health Service8
- ebrary, Inc8
- Geological Survey (U.S.), issuing body6
- Films for the Humanities & Sciences (Firm)4
- Infobase4
- National Research Council (U.S.). Subcommittee on Spacecraft Exposure Guidelines4
- New York (State). Department of Health4
- United States4
- United States. Congress. House. Committee on Public Lands4
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Water Resources and Environment, author4
- United States. Congress. House. Committee on the District of Columbia. Subcommittee on Bicentennial Affairs, the Environment, and the International Community4
- Bullfrog Films, distributor3
- California. Department of Water Resources3
- De Villiers, Marq3
- European Environment Agency3