Sunday Morning Bonus Pulp: F.B.I. Detective Stories, April 1949
Only five issues of this pulp are listed in the Fictionmags Index. This one has a nice, action-packed cover, and a solid line-up of authors: John D. MacDonald, Bruce Cassidy, Roe Richmond, Don James, and several others. I suppose the heroes were all F.B.I. agents, or that the stories at least had some sort of F.B.I. connection. Maybe a little too specialized, which is possibly why the magazine didn't last very long, but I'll bet the stories were pretty good anyway.