DC released two digest-sized Superman collections to tie in with their "Superman at 75" celebration, with little to no pre-release hype. I didn't even know they existed until Nuclear Sub Kyle Benning pointed them out to me after we did a digest-themed episode of The Fire and Water Podcast.
Squarebound with cardstock covers, these books were cover priced $9.99 which is a bit much, nevertheless they make for a handsome package. Superman: The Man of Steel: Believe reprints stories from:
Action Comics #s 0, 810
Adventures of Superman #s 1, 623
Justice League of America Special #1
Superman 80 Page Giant #s 1-2