Being of Arky Ozark ancestry, I may have to look into this one. One of my small prints depicts one of his Camels.......see:
http://www.karrart.com/karrart/2dpre2/sopcm.php
The Arkansas Air Museum at Drake Field in Fayetteville used to have a small exhibit about him- I don't know if it's still there, I haven't visited since the mid-90s.
Robert Karr
www.karrart.com