Frank Frazetta's Moon Maid Sketch Cover Nat Jones

I always wanted a sketch cover by Nat Jones because I am a HUGE fan of his work. Nat put this one on eBay, and I only had to deal with one other bidder to get it. The only thing I wonder about is Frazetta's association with the character. Wikipedia lists The Moon Maid to be a novel by Edgar Rice Burroughs. Frazetta's name is nowhere to be found in the wikipedia listing. 12/2/09 - Updated the picture with a scan from Nat himself. Thanks Nat!