The Valley of Gwangi comic book from Dell Comics
This was one of my favorite movies from my youth.  Dinosaurs and cowboys in one movie, that was a perfect combo for a boy.  And like King Kong, they showed various dinosaurs and not just one. 

       

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!