This cover had been previously credited to George Roussos by DC and Joe Giella and/or Jack Abel by art spotters. Giella denied having inked the cover in a correspondence with Bryan Stroud and Abel inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2008).
Jim Shooter credit added based on an interview with Shooter by the Silver Age Sage
inside front cover; house ad for Secret Six (DC, 1968 series) #2 and The Brave and the Bold (DC, 1955 series) #78
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2007).
letters submitted by Joe Arul; Leonard Rosenberg; Steven Carlberg
listing of DC comics on sale the first week of May; includes cover art for Tomahawk (DC, 1950 series) #117 and Our Army at War (DC, 1952 series) #195
house ad for Superman (DC, 1939 series) #207 [80 Page Giant #G-48], on sale April 9
house ad for Angel and the Ape (DC, 1968 series)
letters submitted by Marv Wolfman; Dennis Casey; Steve Simels
hint submitted by Terry Thomas of Bay City, Michigan