This issue is a variant of Captain America (Marvel, 1968 series) #214.
There exist further variants.
Last Jack Kirby issue. Letters page replies by Roy Thomas.
Marvel Comics Index #8A lists Jim Novak as letterer.
Letters of comment from readers Dwight G. Clark, Willis Nalle, Bob Robinson, and Charles Haskell.Placed between pages 11 and 12 of the main sequence.