This issue is a variant of Marvel Team-Up (Marvel, 1972 series) #62 [30¢]. There exist further variants.
Copyright ©1977 by Marvel Comics Group, a Division of Cadence Industries Corporation.
Cover letters credit confirmed by Todd Klein in The Danny Crespi Files Part 12, posted 23 June 2017 on his blog (Todd Klein's Blog at Goodreads). Previous indexer credited John Costanza.
Letters from readers - Jim Keel, Hal Farley, Donald J. Collins and M. E. Robbins. Letters page replies by Chris Claremont.