On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 23, Part 2, Periodicals, January-December 1969. Class B periodical. Copyright registration number B527017
Letters from: Duffy Vohland (Clarksburg, Indiana), Mark Gruenwald [as Mark Gruenwalk] (Oshkosh, Wisconsin), and Mitchell J. Shields (Marietta, Georgia).