Oregon Wood-frog (Hyla regilla: Cooper, James G., George Suckley, William Cooper, George Gibbs, Asa Gray, and John L. Le Conte. 1859. The natural history of Washington territory, with much relating to Minnesota, Nebraska, Kansas, Oregon, and California, between the thirty-sixth and forty-ninth parallels of latitude, being those parts of the final reports on the survey of the Northern Pacific railroad route, containing the climate and physical geography, with full catalogues and descriptions of the plants and animals collected from 1853 to 1857. Bailliere Bros., London, H. Bailliere;, New York, New York. pp.); Pacific Hyla (Hyla regilla: Yarrow, Henry C. 1882. Check list of North American Reptilia and Batrachia with catalogue of specimens in U. S. National Museum. Bulletin of the United States National Museum (24):1-249); Pacific Tree Toad (Hyla regilla: Stejneger, Leonard and Thomas Barbour. 1917. A Checklist of North American Amphibians and Reptiles. Harvard University Press, Cambridge, Massachusetts. pp.); Pacific Tree Frog (Hyla regilla: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Wood-frog (Hyla regilla: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Pacific Hyla (Hyla regilla: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Pacific Tree-toad (Hyla regilla: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Western Chorus Frog (Pseudacris occidentalis: Wright, Anna Allen, and Alex Hazen Wright. 1933. Handbook of frogs and toads. The frogs and toads of the United States and Canada Comstock Publishing Associates, Ithaca, NY. xi+231pp.); Pacific Tree Frog (Hyla regilla: Schmidt, Karl P. 1953. A Check List of North American Amphibians and Reptiles. 6th Edition. University of Chicago Press, Chicago, Illinois. 280pp.);