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First appearance - Wikipedia
List of superhero debuts - Wikipedia
List of Marvel Comics first appearances - Wikipedia
Today in Marvel History: Spider-Man's First Appearance
Captain Marvel | Creators, Stories, Origin, & Film | Britannica
Captain America | Creators, Stories, & Films | Britannica
Tales of Suspense (1959) #39 | Comic Issues | Marvel
Elmo - Simple English Wikipedia, the free encyclopedia
Daffy Duck | Cartoons, First Appearance, Voice, & Voice Actor
An Evolutionary Timeline of Homo Sapiens | Smithsonian