On-sale date from copyright registration.
Pencil credits given on Neal Adams website (it was previously credited to Adams). Mike Napolitano states that he owns the original cover art, where the Infantino/Anderson signatures appear under the Superman figure (but were whited out). Curt Swan stated to Mike Napolitano that he made extensive corrections to the Superman figure (6 September 2004). Credits before this change were solely to Curt Swan for pencils.
Story continues in Action Comics #402.