Seattle, Washington: National Park Service, Pacific Northwest Region. 1992. First edition - A comprehensive history of this geologically unique National Monument, set on the Great Rift in Idaho, including chapters on its setting and significance, on developing it, and on managing the natural resources. Illustrated with black and white photographs, maps (including some folding ones.) Notes, bibliography, chronology, index. Large format. (8 1/2 by 11 inches), 393 pp.