Doctor Doom: Monarch of Latveria

Fantastic Four #5
Fantastic Four #6
Fantastic Four #10
Fantastic Four #16
Fantastic Four #17
Amazing Spider-Man #5
Fantastic Four #23
Fantastic Four Annual #2
Fantastic Four #39
Fantastic Four #40
Fantastic Four #43
Fantastic Four Annual #3
Avengers #25
Fantastic Four #57
Fantastic Four #58
Fantastic Four #59
Fantastic Four #60
Daredevil #37
Daredevil #38
Fantastic Four #73
Marvel Super-Heroes #20
Fantastic Four #84
Fantastic Four #85
Fantastic Four #86
Fantastic Four #87
Sub-Mariner #20

Note: Dr. Doom doesn't show up in Fantastic Four #73, but pairs nicely as a result of his appearances in Daredevil #37-#38

See: Fantastic Four: The World’s Greatest Comics Magazine