40 sources
2001: A Space Odyssey #5 (Apr. 1977): "Norton of New York 2040 A.D."The Amazing Spider-Man (vol. 1) #167 (Apr. 1977): "..Stalked by the Spider-Slayer!"Annie Hall (1977)The Avengers (vol. 1) #158 (Apr. 1977): "When Avengers Clash!!"Bernard the Brave (vol. 8) (Apr. 1977)Black Lightning (vol. 1) #1 (Apr. 1977): "Black Lightning"Captain America (vol. 1) #208 (Apr. 1977): "The River of Death!"Daredevil (vol. 1) #144 (Apr. 1977): "Man-Bull Means Mayhem!"The Defenders (vol. 1) #46 (Apr. 1977): "Who Remembers Scorpio?"Doctor Strange (vol. 2) #22 (Apr. 1977): "Mind Trip!"The Eternals (vol. 1) #10 (Apr. 1977): "Mother!"Freedom Fighters (vol. 1) #7 (Apr. 1977): "The Emperor of the North Pole!"Ghost Rider (vol. 2) #23 (Apr. 1977): "Wrath of the Water Wizard!"The Inhumans (vol. 1) #10 (Apr. 1977): "Isle of the Asteroid Web!"The Invaders (vol. 1) #15 (Apr. 1977): "God Save the King!"Iron Fist (vol. 1) #12 (Apr. 1977): "Assault on Avengers' Mansion!"Iron Man (vol. 1) #97 (Apr. 1977): "Showdown with the Guardsman!"Justice League of America (vol. 1) #141 (Apr. 1977): "No World Escapes the Manhunters!"Marvel Premiere #35 (Apr. 1977): "The 3-D Man!"Marvel Presents #10 (Apr. 1977): "Death-Bird Rising!"Marvel Spotlight (vol. 1) #33 (Apr. 1977): "(Don't Fear) The Reaper!"Marvel Team-Up (vol. 1) #56 (Apr. 1977): "Double Danger at the Daily Bugle!"Marvel Two-in-One (vol. 1) #26 (Apr. 1977): "The Fixer and Mentallo Are Back and the World Will Never Be the Same!"Master of Kung Fu #51 (Apr. 1977): "Epilogue Brass and Blackness (A Death Move!!)"Ms. Marvel (vol. 1) #4 (Apr. 1977): "Death is the Doomsday Man!"Nova (vol. 1) #8 (Apr. 1977): "When Megaman Comes Calling - Don't Answer!"Peter Parker, The Spectacular Spider-Man #5 (Apr. 1977): "Spider-Kill!"
The Rampaging HulkThe Super Friends (vol. 1) #4 (Apr. 1977): "Riddles and Rockets!"Superboy and the Legion of Super-HeroesSuperman (vol. 1) #310 (Apr. 1977): "The Man with the Kryptonite Heart"The Teen Titans (vol. 1) #47 (Apr. 1977): "Trouble -- Which Rhymes with Double!"Thor (vol. 1) #258 (Apr. 1977): "If the Stars Be Made of Stone!"The Tomb of Dracula (vol. 1) #55 (Apr. 1977): "Requiem for a Vampire!"X-Men (vol. 1) #104 (Apr. 1977): "The Gentleman's Name is Magneto"