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231 pp. Bookmarks supplied by UO. Includes maps. Published June, 1996. Captured December 21, 2007.
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.
181 pp. Maps, tables. Published September, 2008. Captured January 29, 2009.
224 pp. Includes maps and figures. Published February, 2003. Captured May 7, 2008.