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2006
United States. Environmental Protection Agency. Region X, and United States. Environmental Protection Agency. Region X. Office of Environmental Assessment. Ecological Condition of the Estuaries of Oregon and Washington. Vol. EPA-910-R-06-001. Seattle, Wash.: U.S. Environmental Protection Agency, Region 10, Office of Environmental Assessment, 2006.
→ archive.epa.gov/emap/archive-emap/web/pdf/cemapfinal.pdf