I still have my SUPERMAN vs. THE FLASH Limited Collector's Edition comic book from 1976...always enjoyed it! Especially the HOW TO DRAW THE FLASH feature by Silver Age FLASH artist, CARMINE INFANTINO.
I also had this issue of SUPERMAN #199 (1967) when I was little. It originally featured the comic story reprinted in the Limited Collector's Edition. This cover was drawn by the great CARMINE INFANTINO.