Belmont (1963-1967)
Agência Portuguesa de Revistas
Portugal, circa 1965. This reprints the Belmont #6, "Cry Shadow!"
Gosset and Dunlap (1966)
Bantam (1969-1970)
Pyramid/Jove (1974-1978)
Covers by Jim Steranko, except number 13 of the Jove edition.
I'm missing Jove's #1, #11 and #12.
(My thanks to Tony Robertson who pointed out that Jove's #3 was not by Steranko and that he repainted the cover for Jove's #13, but it was never published.
You can find all the Steranko covers here.)
The cover on the right for #4, "Hands in the Dark", was misprinted for the 2nd printing of the paperback. It was actually the cover for #6. I have two copies of the original and correct #4, one of which is signed by Steranko, so the other is available for trade.