The Mighty Thor King Size Annual #6 comic book from Marvel Comics Group
I can still remember reading this book as a kid.  It was my first introduction to the Guardians of the Galaxy, a group of heroes that I quickly became fans of.  It prompted me to begin my search at comic shows for more appearances of the group.  This was a fun comic that I still pull out and read at least once a year.

This is a scan of an old comic book. This item is not for sale. But you can find it on ebay.
Click below to go to ebay and search!