38 sources
The Avengers (vol. 1) #194 (Apr. 1980): "Interlude"Captain America (vol. 1) #244 (Apr. 1980): "The Way of All Flesh!"The Defenders (vol. 1) #82 (Apr. 1980): "Wizard-Death!"
Detective ComicsDoctor Strange (vol. 2) #40 (Apr. 1980): "Dawn of Death!"Ghost Rider (vol. 2) #43 (Apr. 1980): "Night of the Crimson Mage!"Green Lantern (vol. 2) #127 (Apr. 1980): "Battleground: Oa!"The HulkThe Incredible Hulk Weekly #57 (2 Apr. 1980): "The Black Knight"Justice League of America (vol. 1) #177 (Apr. 1980): "The Graveyard Gambit"Legion of Super-Heroes (vol. 2) #262 (Apr. 1980): "The Planet That Captured the Legion"Machine Man (vol. 1) #14 (Apr. 1980): "The Man Who Could Walk Through Walls"Marvel Premiere #53 (Apr. 1980): "The Ending, in Anger!"Marvel Team-Up (vol. 1) #92 (Apr. 1980): "Fear!"Marvel Two-in-One (vol. 1) #62 (Apr. 1980): "The Taking of Counter-Earth!"Master of Kung Fu #87 (Apr. 1980): "Warriors of the Golden Dawn Part 5: The Chrysalis and the Peacock"The Micronauts (vol. 1) #16 (Apr. 1980): "Rendezvous in Sub-Atomica!"The New Adventures of Superboy #4 (Apr. 1980): "Look at Me World, I'm Astralad!"Peter Parker, The Spectacular Spider-Man #41 (Apr. 1980): "Meteor Madness!"Power Man and Iron Fist (vol. 1) #62 (Apr. 1980): "One Must Die!"ROM #5 (Apr. 1980): "A House Is Not a Home!"The Savage She-Hulk #3 (Apr. 1980): "She-Hulk Murders Lady Lawyer!"Spider-Woman (vol. 1) #25 (Apr. 1980): "To Free a Felon!"ThorThe Tomb of DraculaThe Uncanny X-Men (vol. 1) #132 (Apr. 1980): "And Hellfire is Their Name!"The Warlord (vol. 1) #32 (Apr. 1980): "Land of the Titans"