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[Linked Image from 3.bp.blogspot.com]

An Arthur Adams house ad for CLASSIC X-MEN.

Adams did covers and/or pin-ups for the first dozen or two issues. Despite these reprints including new material, I recommend buying X-MEN reprints of the Cockrum and Byrne issues in some other reprint edition. This particular series, the editor added and deleted pages, basically slicing and dicing the original material, so you neither get the feel or the full material of the original issues reprinted. But in this era, you couldn't be choosy, there weren't any MARVEL MASTERWORKS hardcovers or trades yet.

There were also a few dozen John Bolton new backups, about 10 pages per issue, as a regular series. Also reprinted in a collected edition a few years ago.