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Amphibians of Oregon, Washington and British Columbia
A Field Identification Guide
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Charlotte Corkran
charlotte_corkran Photo Naturalist, author and photographer Charlotte Corkran works as an independent wildlife consultant based in Portland, Oregon. She has done extensive research on amphibian populations in the Pacific Northwest.

Chris Thoms
chris_thoms Photo CHRIS THOMS was a biologist employed with the U.S. Army Corps of Engineers in Oregon until her passing in October, 2002, at the age of 59. Chris was a certified Professional Wetland Scientist, natural science illustrator and field naturalist. She worked with Charlotte Corkran on several projects through the Northwest Ecological Research Institute, designing field methods for identifying the early development stages of amphibians.