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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 3 new pages by other writers and artists to the original stories, bringing stories originally 17 pages to 20 pages in each issue, and sometimes deleting Byrne/Autin pages, basically slicing and dicing the original material, so you neither get the feel or the full material of the original issues being reprinted. But in this era, you couldn't be choosy, there weren't any MARVEL MASTERWORKS hardcovers or trades yet.

There is also a long run of John Bolton new backups, about 13 pages per issue, as a regular back-up series in issues 1-35.
The new John Bolton back-up stories were also reprinted in a collected edition a few years ago.


CLASSIC X-MEN
https://readcomiconline.li/Comic/Classic-X-Men/Issue-1?id=64555