Orr, E. L., & Orr, W. L. (1996). Geology of the Pacific Northwest. McGraw-Hill.
Chicago Style (17th ed.) CitationOrr, Elizabeth L., and William L. Orr. Geology of the Pacific Northwest. New York: McGraw-Hill, 1996.
MLA (9th ed.) CitationOrr, Elizabeth L., and William L. Orr. Geology of the Pacific Northwest. McGraw-Hill, 1996.
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