Comic Covers Featuring Doctor Doom.
This list also includes alternative world Doom's (Peter Porker, The Spectacular Spider-Ham #1), Doombot covers (The Punisher #28 - Change Partners and Dance) and Doom Mask covers (Fantastic Four #260 - When Titans Clash!)
Also included is The Sensational She-Hulk #18 which isn't actually Doom (It's his cousin). However, the mask is the same.
Any help would be appreciated!