Sunday Morning Bonus Pulp: Action Novels, February 1929
You don't see horse racing covers very often on pulps, or at least I haven't noticed that many. The story this cover illustrates is by Jack Byrne, better known as an editor for Fiction House and later for Munsey, but from what I've read of his work he was a pretty good writer, too. And the other authors in this issue are top-notch: W.C. Tuttle, Frederick C. Davis, and Albert Richard Wetjen. That's a nice line-up.