I've begun the second book in the series and am really excited to see where Prudence takes us! And learn more about her fellow Detourists ... yes, it's quite true what they say. The author is at the mercy of the characters. 

While doing research online (never-ending and always interesting), I ran across a scan of a 1927 Southwest Indian Detours brochure! 

https://fredharveyjewelry.com/1927-fred-harvey-indian-detour-harveycars-brochure/

It's chock-full of photographs of Harveycars, Couriers, drivers, Detourists, Harvey House hotels, and various sites, as well as a complete itinerary with notes and descriptions. There are many photos of Pueblo people, as well. 

To learn more about the Ilfeld family of Las Vegas, https://swja.library.arizona.edu/content/ilfelds-family-story