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Butterflies of Oregon, Their Taxonomy, Distribution, and Biology
By Andrew D. Warren
C.P. Gillette Museum of Arthropod Diversity, Dept. of Bioagricultural Sciences and Pest Management, Colorado State University, 2005
ISBN: None Available
Cite: 1914507 with citation markup [cite:1914507]
408 pages

Book / paper is referenced extensively by other authors (Pyle, James, Nunnallee, etc.)
in their butterfly books about Cascadia / Pacific Northwest.