Saturday Morning Western Pulp: Mammoth Western, March 1948
I can't tell if this hombre's hat got shot off or just fell off, so I can't say for sure if it's an Injury to a Hat cover. But I can tell you that the cover is by Robert Gibson Jones, this issue was edited by Ray Palmer, and the authors who have stories inside include Dwight V. Swain, "Alexander Blade", Chester S. Geier, Robert Moore Williams, Paul W. Fairman, William P. McGivern, H.B. Livingston (who was really Berkeley Livingston), and Lester Barclay (who was also Berkeley Livingston). In other words, the usual suspects for a Ziff-Davis pulp. But it's a pretty entertaining group of usual suspects.