On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 22, Part 2, Periodicals, January-December 1968. Class B periodical. Copyright registration number B474873.
Letters of comment from Harvey Scott; Erik Stone; David Lomazoff; Vic Rosello; George Olshevsky; H.B.; and Don McRitchie; includes two panels reproduced from previous issues.