Detail from a page of the Flame story from Wonderworld Comics (Fox, 1939 series) #7 that is reprinted inside.
Front endpapers. Recolored (red lines on yellow background) detail from the Silver Streak story printed inside.
This is the artwork from the cover of Mystery Men Comics (Fox, 1939 series) #2 but with the trade dress removed and the title "Supermen" in a Fox Publications style instead.
Silver Streak is a detail from the story reprinted inside
This book's contents page credits only Joe Simon as writer and Simon/Kirby as artists, but the GCD index for the original issue is credited to Simon/Kirby (script), Kirby (pencils) and Simon/Avison/Gabriele (inks), so the credits here have been made to match.
Back endpapers. Recolored (orange lines on pink background) detail from the Blue Bolt story printed inside.