I picked up a set of 1972 proof sheets on eBay awhile back for a strip called Navajo Canyons. I received the first two Sunday strips, which tell traditional Navajo folk tales, and the first week of a daily strip about a Native American named Johnny Navajo who has been educated in a white school and is now returning to his family out west.
There is nothing particularly mysterious about a set of tryout strips that never got published, but there is one aspect of these that piqued my interest. Note that the Sunday strip above includes an NEA copyright slug in the final panel. That would seem to indicate that the strip was, at the least, picked up by the syndicate and marketed to their clients. Is that as far as it got?
Credited creators are Jason Chee and G. Johnson. I find several Jason Chees in a Google search, including a Native American-inspired artist, but no current contact info. If Jason happens to read this, how about telling us what happened to your Navajo Canyons?