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First appearance of Black Knight III, Origin of Black Knight III
First Appearance of Cyclops; First Appearance of Beast, First Appearance of Angel; First Appearance of Marvel Girl; First Appearance of Iceman; First Appearance of Magneto; First Appearance of Professor X;
First X-Men comic issue
First full appearance HIM (Adam Warlock)
Iron Man and Sub-Mariner #1
Iron Man story by Colan and Craig continues from Tales of Suspense #99 & continues in Iron Man #1; Sub-Mariner story by Colan continues from Tales of Astonish #101 & Sum-Mariner #1; Colan and Craig cover; Pre-dates Iron Man #1 and Sub-Mariner #1