Justice League of America #56 from DC Comics
I remember after reading a comic with a clash between the two legendary groups, I was amazed.  I went to every comic show after that and looked for every battle I could find.  I remember how much I enjoyed them and still do.  I am a sucker for big battles between lots of heroes and/or villains. 

       

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!