Scale [ca. 1:221,760. 1 in. to approx. 3.5 miles] ; 1 map : col. ; 51 x 71 cm ; Relief shown by contours and spot heights ; Includes township and range grid ; "Map no. 40-40" ; Includes index map ; Shows power lines, triangulation stations, boundary monuments, roads, telephone lines, mines, bench marks, etc. ; U.S. Dept. of the Interior, Bureau of Reclamation