Through ABE Books (
AbeBooks Official Site - New & Used Books, New & Used Textbooks, Rare & Out of Print Books), I was able to fill out my set of
The American Heritage New Illustrated History of the United States (1963). Volume 13, "World War I and the Twenties," has this beautiful painting on the cover:
The text states that it shows Lt.
Douglas Campbell tangling with a German Rumpler. The picture is credited to the U.S. Air Force, but nothing about the artist or the title.
There are plenty of copies of this book listed at ABE Books, the source of the above image, which looks even better in real life.