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72 pp. Bookmarks supplied by UO. Includes maps and figures. Adopted November 8, 1990. Captured December 21, 2007.
48 pp.Bookmarks supplied by UO. Maps, figures, tables, illus. Published September 18, 2006. Captured December 12, 2008.
68 pp. Maps, tables, charts, figures, illus. Published November, 2007. Captured December 12, 2008.