Davy Crockett's Almanack has a wonderful gallery of Ken Maynard movie posters. If you're curious about Maynard's movies, Turner Classic Movies will be playing one of his movies, In Old Santa Fe, on Friday, July 29. You can view TCM's full schedule for the month here.
If you can't wait until the 29th, you can go here to see a full-length Ken Maynard movie that's in the public domain: Tombstone Canyon (1932).
And if you want to read (or re-read) my post on Ken Maynard from a while back, go here.