The Sharlot Hall Museum in Prescott, Arizona also hosts an annual
cowboy poetry event. I don't know whether or not they've ever done
an exhibit on this topic, but they may have some materials you could
use or may be able to give you some leads. They can be reached at:
Sharlot Hall Museum
415 W. Gurley St.
Prescott, AZ 86301
520-445-3122
Amy A. Douglass
Tempe Historical Museum
[log in to unmask]