Boise: Department of the Interior, June 1946. 20, 55, xxiii, 540p. (the texts are reproduced from typescript) plus a capacious printed map-pocket jammed with "Maps of Five States" that have color onlay. The illustrations scattered throughout the printed matter include sizeable b&w photos, charts and line maps. Softbound, over 2 inches thick, cover wraps a little edgeworn, a very good copy. Project planning report no. 1-5.0-1.