On-sale date from copyright registration.
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/).
Published in co-operation with the National Social Welfare Assembly.
On inside front cover. Previously published in DC comics cover-dated July 1954.
Letters from Leonard Tirado, Alan Davis, Jim Lawson, Mike Annuziato, Conan Fanshowe, Paul Wiese, Mike Morris, Bernard Westbrook, and Lon Mitchell, along with a logo illustration.
Famous old Superman-Batman team-ups. Note at bottom of the page that Edmond Hamilton is the Superman-Batman author.