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Petersen, Christine. "Range expansion in the northeast Pacific by an estuary mud crab -- a molecular study." Biological Invasions 8 (2006): p.565-576.
Peters, Robert, Bruce Jaffe, Guy Gelfenbaum, and Curt Peterson. Cascadia tsunami deposit database [electronic resource] In U.S. Geological Survey Open-File Report. Vol. no.03-13. [Menlo Park, Calif.]: U.S. Geological Survey, 2003.
Perry, Timothy D.. Do Vigorous Young Forests Reduce Streamflow? Results from up to 54 Years of Streamflow Records in Eight Paired-Watershed Experiments in the H. J. Andrews and South Umpqua Experimental Forests. M.S. ed. Corvallis, Or.: Oregon State University, 2007.
Percy, Katherine L., David A. Bella, Peter C. Klingeman, Charles K. Sollitt, James B. Kennedy, Larry S. Slotta, and Water Resources Research Institute. Descriptions and information sources for Oregon estuaries In WRRI. Vol. no. 19. Corvallis, Or.: Water Resources Research Institute, Oregon State University, 1973.
Penaluna, Brooke E., and Loretta Ellenburg. "Reoccurrence of the Umpqua chub (Oregonichthys kalawatseti) in the North Umpqua after almost a century." Northwestern Naturalist 100 (2019): p.208-210 .
Penaluna, Brooke E., Jonathan D. Burnett, Kelly Christiansen, Ivan Arismendi, Sherri L. Johnson, Kitty Griswold, Brett Holycross, and Sonja H. Kolstoe. "UPRLIMET: UPstream Regional LiDAR Model for Extent of Trout in stream networks." Scientific Reports (Nature Publishing Group) 12 (2022): 15 p.
Pearsons, Todd N.. Ecology and Decline of a Rare Western Minnow: The Oregon Chub (Oregonichthys crameri). M.S. ed. Corvallis, Or.: Oregon State University, 1989.
Pearson, H. F.. "The silver horde of the Umpqua. (pt.2)." Umpqua Trapper. 2 (1966): p.12-15.
Pearson, H. F.. "The silver horde of the Umpqua. (pt.1)." Umpqua Trapper. 2 (1966): P.7-10.
Pearl, Christopher A., Michael J. Adams, and Bonnie McCreary. "Habitat and co-occurrence of native and invasive crayfish in the Pacific Northwest, USA." Aquatic Invasions 8, no. no.2 (2013): p.171-184.
Pazdral, Rosemary. Factors Influencing Streamflow Generation Processes in Rain-dominated, Coastal Watersheds in Oregon. Ph. D. ed. Corvallis, Or.: Oregon State University, 2021.
Paulsen, Carl G.. Floods of 1950 in southwestern Oregon and northwestern California In Water-Supply Paper (Washington, D.C.). Washington, D.C.: U.S. G.P.O., 1953.
Pauley, Gilbert B., Karen L. Bowers, G. L. Thomas, U.S. Army Engineer Waterways Experiment Station. Coastal Ecology Group, and National Wetlands Research Center(U.S.). Species profiles: life histories and environmental requirements of coastal fishes and invertebrates (Pacific Northwest). chum salmon In Biological Report (Washington, D.C.). Washington, D.C.; Vicksburg, Miss.: U.S. Fish and Wildlife Service; Coastal Ecology Group, 1988.
Pauley, Gilbert B., Bruce M. Bortz, Michael F. Shepherd, U.S. Army Engineer Waterways Experiment Station. Coastal Ecology Group, and National Wetlands Research Center(U.S.). Species profiles: life histories and environmental requirements of coastal fishes and invertebrates (Pacific Northwest): steelhead trout In Biological Report (Washington, D.C.). Vol. no.82 (11.62). Washington, D.C.; Vicksburg, Miss.: U.S. Fish and Wildlife Service; Coastal Ecology Group, 1986.
Pauley, Gilbert B., David A. Armstrong, Thomas W. Heun, U.S. Army Engineer Waterways Experiment Station. Coastal Ecology Group, and National Wetlands Research Center(U.S.). Species profiles : life histories and environmental requirements of coastal fishes and invertebrates (Pacific Northwest): Dungeness crab In Biological Report (Washington, D.C.). Vol. no. 82-11.63., 1986.
Pauley, Gilbert B., Kevin Oshima, Karen L. Bowers, and G. L. Thomas. Species profiles: life histories and environmental requirements of coastal fishes and invertebrates (Pacific Northwest): sea-run cutthroat trout In Biological Report (Washington, D.C.). Vicksburg, Miss.: Coastal Ecology Group, Waterways Experiment Station, U.S. Army Corps of Engineers, 1989.
Partnership for the Umpqua Rivers. Clover Creek Restoration [digital photograph]., 2006.
Partnership for the Umpqua Rivers. Instream Photo from the Upper Umpqua River [digital photograph]., 2005.
Partnership for the Umpqua Rivers. [Slide Catalog, Organized by Creek]., 1999.
Partnership for the Umpqua Rivers. Bear Wallow Creek Culvert [digital photograph]., 2006.
Partnership for the Umpqua Rivers. Fish Passage Project Photo from the Middle Cow Creek Watershed [digital photograph]., 2005.
Partnership for the Umpqua Rivers. Fish Viewing Station at Winchester Dam [digital photograph]., 2006.
Partnership for the Umpqua Rivers. Jack Creek Culvert Replacement [digital photograph]., 2006.
Partnership for the Umpqua Rivers. Photo of Big Creek structure placement [digital photograph]., 2006.
Partnership for the Umpqua Rivers. Fortune Branch Creek Culvert [digital photograph]., 2006.

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