Romance books seem to be on the decline by this point while monsters and science fiction hadn't quite struck a chord yet. Probably in large part due to the still relatively recent Keafauver hearings and the creation of the Comics Code Authority. And, naturally, superheroes hadn't quite caught on yet, and the JLA was still a little while off.
But, without further ado, let me present the spinner rack of October 1958...
Personally, I think what's collectively note-worthy here is how bad everything looks. Sure, the industry was still trying to figure out what was and wasn't allowable under the Comics Code, but many of these covers are just plain poorly designed. Lots of visually uncomfortable dead spaces, especially between the main artwork and the logo. Somewhat indicative of the industry at the time, I suppose.
And, say, what do you suppose Fred Wertham would've said to that Wonder Woman cover?