On sale date from the publication date found in the Catalog of Copyright Entries, Third Series, Volume 15, Part 2, Number 1, Periodicals, January-June 1961. Second class permit. Copyright number B899515.
"Superman's Greatest Feats" actually appears in that month's Superman 146.
23rd anniversary story. Inker credit confirmed by Pat Lang (April 11, 2004). Inker credit previously given to: George Klein (Gene Reed credit) or Stan Kaye.
Job number appears on original printing but not on this printing.
Includes letters from Douglas Dowdy, Jimmy Longgardner, Steven Sussman, Viola M. Schrader, Joseph Blitman, Leon Wieseltier, MIke Hyatt, Darla Middbrook.