Marvel Super Heroes #18 features the origin and 1st appearance of the Guardians of the Galaxy.  This is the GOTG grail!  Major Vance Astro, Yondu, Udonta, Charlie-27, and Martinex T'Naga.  Beautiful cover art by Gene Colan.  The giant-sized book has a nice spine and good alignment.  It's color are rich and brilliant.  This Silver Age key book is graded 9.4 NM with white pages by CGC.