Interesting pictorial map illustrating the Oregon Trail, published by the American Pioneer Trails Association.
Irvin "Shorty" Shope (Boulder, MT 1900 - 1978 Helena, MT) was raised on a ranch in Montana, and fell under the influence of the western painter Edgar S. Paxson while still in high school. Between 1919 and 1930, Shope worked as a cowboy on Montana ranches, while studying art through a correspondence course. He corresponded with Charles Russell, who encouraged him to remain in the west, rather than going to art school in the east. In addition to painting and illustrations for books and commercial art, he drew a number of maps of Western exploration for school classrooms.
Shope was a charter member of the Cowboy Artists of America.