17 sources
The Avengers (vol. 1) #63 (Apr. 1969): "And in this Corner... Goliath!"Captain America (vol. 1) #112 (Apr. 1969): "Lest We Forget!"Captain Marvel (vol. 1) #12 (Apr. 1969): "The Moment of the Man-Slayer!"Captain Savage #13 (Apr. 1969): "The Junk-Heap Juggernauts"Daredevil (vol. 1) #51 (Apr. 1969): "Run, Murdock, Run!"Doctor Strange (vol. 1) #179 (Apr. 1969): "The Wondrous World of Doctor Strange"Fantastic Four (vol. 1) #85 (Apr. 1969): "Within This Tortured Land"Green Lantern (vol. 2) #68 (Apr. 1969): "I Wonder Where the Yellow Went!"Iron Man (vol. 1) #12 (Apr. 1969): "The Coming of the Controller!"Nick Fury, Agent of S.H.I.E.L.D. (vol. 1) #11 (Apr. 1969): "The 1st Million Megaton Explosion"Sgt. Fury and His Howling Commandos (vol. 1) #65 (Apr. 1969): "Blood Is Thicker!"
The Silver SurferThe Sub-Mariner (vol. 1) #12 (Apr. 1969): "A World Against Me!"Thor (vol. 1) #163 (Apr. 1969): "Where Dwell the Demons!"X-Men