This is Supercomix Fantastic Four 1, published by Republican Press in 1976.
Interestingly they chose the Iconic Cover of Marvel Comics' Fantatstic Four #1 (1961), however the Supercomix cover is a much poorer quality image. The Story is reprinted from Marvel Comics' Fantastic Four #95 (1970):
"Tomorrow--World War Three!"
32 Pages, Full colour.
Cover and Marvel Comics' original covers of Fantastic Four 1 & 95:
Supercomix The Invincible Iron Man, Fantastic Four and Captain America