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Here's Giffen's first published work, from MARVEL PREMIERE magazine.

First, Giffen's first published art, in issue 4 (January 1976), a single page illustration accompanying a text article (on page 42).
https://viewcomiconline.com/marvel-preview-issue-4/

And then Giffen's first published story, in issue 7 (Summer 1976), an 18-page "Sword In the Star" story, by Bill Mantlo with Giffen pencils and inks.
Giffen's first pro work, and also the first appearance of Rocket Raccoon, that would later evolve into the GUARDIANS OF THE GALAXY comic series, popular enough to then become a few blockbuster movies.
https://onemillioncomics.com/marvel-preview-issue-7/

That's one heck of a start !

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