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willis a evans
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Fish migration and fish passage
Willis A. Evans · USDA Forest Service, Region 5
80 sayfa · 1974
Fishes / Fishways / Migration / Design and construction
Fishes of Yosemite National Park
Willis A. Evans, O. L. Wallis, Glenn D. Gallison · Yosemite Naturalist Department and the Yosemite Natural History Association
30 sayfa · 1944
Fishes / Trout