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1952
Grenfell, R. A.. "Umpqua River investigations." Oregon State Game Commission, Fishery Division. Annual Report - Fishery Division (1952): p.1-7.
→ ir.library.oregonstate.edu/concern/technical_reports/xw42nd137
1951
Grenfell, R. A.. "Umpqua River investigations." Oregon State Game Commission, Fishery Division. Annual Report - Fishery Division (1951): 1-13.
→ ir.library.oregonstate.edu/concern/technical_reports/ft848v43t