Strange Mysteries was one of these original material titles, and although it's obviously Iger Studio material, very little of it has been concretely identified to specific creators. One exception is Strange Mysteries #19, which contains the spectacular story Was He Death-proof? reprinted from Journey into Fear #1 and credited to Matt Baker. Superior understood what the market wanted here, and delivered some classic Pre-Code Horror covers and stories for this series.
Curiously, there are no Comics Code seals on any of these issues, even those appearing up to 18 months after the Code seal had been virtually universally put into use by U.S. publishers . One might be tempted to think that these were a handful of Canada-only publications. However, American News Company distributed late-era Superior comics, and it's hard to imagine a title like U.S. Fighting Air Force was not meant for distribution in the United States.