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United States. Army. Corps of Engineers. Portland District. Draft Supplemental Environmental Impact Statement: Days Creek Lake Project, Umpqua River Basin, Oregon. Portland, Or.: The District, 1976.
United States. Army. Corps of Engineers. Portland District, United States. Bureau of Land Management. Roseburg District Office, and United States. Bureau of Reclamation. Final Environmental Impact Statement: Milltown Hill Project, Elk Creek Subbasin, Umpqua River Basin, Douglas County, Oregon. Boise, Idaho: U.S. Bureau of Reclamation, 1992.
→ tinyurl.com/2p8jn87w
United States. Army. Corps of Engineers. Portland District. Report of the Chief of Engineers, U.S. Army. Part 2. Commercial Statistics. Waterborne Commerce of the United States for the Calendar Year . . .., 1926.
→ catalog.hathitrust.org/Record/008978819
United States. Army. Corps of Engineers. Portland District. Umpqua River and Tributaries, Oregon: Review of Survey Report: Transcript of Public Hearing. [Portland, Or.]: U.S. Army Corps of Engineers, Portland District, 1957.
United States. Dept. of the Interior, United States. Army. Corps of Engineers. Portland District, and United States. Federal Water Pollution Control Administration. Water Supply and Water Quality Control Study: Tiller and Galesville Projects, Umpqua River Basin, Oregon. Portland, Or.: U.S. Dept. of the Interior, Federal Water Pollution Control Admin., Northwest Region, 1966.