It was "Modern Collector's Review", Bob,
and was actually published in 1969 - my memory is also not to be trusted, it seems.
John Giunta did "Crom the Barbarian", not Conan, in Avon's Out of this World Adventures.
Dan Adkins did three Warren covers:
Eerie 9 & 12
Creepy 12
Adkins inked Smith/Windsor-Smith on these Conan stories:
The Coming of Conan
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #1
October 1970 Marvel
"The Lurker Within (adapted from REH story ""The God in the Bowl"")"
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #7
July 1971 Marvel
Hawks from the Sea
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #19
October 1972 Marvel
The Black Hound of Vengeance
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #20
November 1972 Marvel
The Monster of the Monoliths (inspired by REH story 'The Black Stone')
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #21
December 1972 Marvel
The Coming of Conan
Conan the Barbarian / story / 20 pages Conan the Barbarian (1970 series) #22
January 1973 Marvel
The Shadow of the Vulture
Conan the Barbarian / story / 21 pages Conan the Barbarian (1970 series) #23
February 1973 Marvel
and ALL I "know" is how to use GCD, Bob. Just go to
www.comics.org and click "Advanced Search" to get real answers to questions that you've been wondering about. No need to speculate or even try to remember. I sure as hell don't. Not when there's a definitive resource like GCD available.
You can stop guessing and look it up.
As for "significant" comic artists, I'll be happy to debate my choices any time you wish. All I ask is that things stay objective.
Peace, Jim (|:{>