This issue has variants.
Romita inks credit was published in The Marvel Comics Index (1981). Romita cover inker credit provided 2006 by Nick Caputo. Previous indexer credited Frank Giacoia. Official Index to the Marvel Universe (2011) repeated the Romita credit.
Sources for letters credit are The Marvel Comics Index, and Official Index to the Marvel Universe.
Letters from Dennis Melvyn, Mark Brooks, Don Fleming; Marvel Value Stamp Series A #24 (The Falcon); house ad for Worlds Unknown #6.