Important map of the region of the present-day intersection of Idaho, Montana, Wyoming and Utah. Wheat considered the map the best representation of the region during this period. It shows the headwaters of the Wind, Sweetwater, Green (Colorado of the West), Snake, and Salmon rivers relatively accurately. The course of the Bear River to Lake Bonneville (Salt Lake), the Three Tetons and the 3 Butes east of the Great Lava Plain are well located.

References: Wheat [TMW] #423.

Condition: B

Issued folding, now pressed with tissue-reinforced folds on verso. Margin extended at binding side with slight loss of neatline and a couple of repaired tears into border. Later color.