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 B474866.
Cover alterations by Marie Severin, as observed from the original as seen in the Doctor Strange Masterworks.
Letters of comment from Harvey Sobel, Dennis Moore, Don Tyler, Gabe Eisenstein and Gene Wallace.