Robin does not appear.
Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Inside front cover.
credits confirmed by Cary Bates
Letters from James Benning, Andy Penry and Al Taylor, Linda Simpson, Ben Creisler, Marc Schrechter, Gregory Feldman, Randy Garron, Henry Ryder, and Wynn Brewster.
Surprise Feature