Scale 1:1,761,000. 1 in. = about 28 miles, Lambert conformal conic proj
Relief shown by spot heights.
Includes tourist information and "Relief Map of Idaho, Montana, and Wyoming."
On verso: indexes, table of "Principal public recreation areas," ski areas, and ancillary maps: Glacier National Park -- Yellowstone National Park [with 4 insets] -- Craters of the Moon National Monument -- Grand Teton National Park -- Idaho Falls -- Boise -- Helena -- Butte -- Great Falls -- Billings -- Casper -- Cheyenne -- Coeur d'Alene.