On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 26, Part 2, Periodicals, January-December 1972. Copyright registration number B718330. Copyright given to Magazine Management Co., Marvel Comics Group.
Sal Buscema pencils per Nick Caputo, May 2011.
Script credits from Steve Englehart (http://www.steveenglehart.com/Comics/First%20Marvel%20Scripts%20I.html) 24 April 2008