Richard pointed out that Idaho Parks still has copies of its wagon poster for sale. We first ran across this poster back in 2015 at a gift shop outside the City of Rock State Park in southwestern, Idaho. It’s a neat little place to visit if you have time to make a detour. At the time, you could also head south from there and enter Utah along dirt roads, then drive south until the dirt roads reach the original Transcontinental railroad grades. It was a fun excursion: http://www.ewillys.com/2015/04/14/day-2-mon-apr-13th-rocks-trcks-dusty-roads/.