The on-sale date is the publication date reported in the U. S. Copyright Office filing.
An earlier indexer provided an on-sale date of July 13. No citation was given, although another indexer notes that it matches a listing in the fanzine The Comics Reader.
Possible Adkins cover inker credit provided 2006 by Nick Caputo. Marvel Comics Index #8A lists Frank Giacoia as inker and Gaspar Saladino as letterer.