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48 pp. Maps, figures, chart, illus. Published March 3, 2006. Captured September 18, 2009.
39 pp. OCR and bookmarks supplied by UO. Map. Adopted October 1, 1980. Captured December 1, 2008.
173 pp. Bookmarks supplied by UO. Includes maps and figures. Adopted March 24, 1988. Captured October 10, 2007.