How to use the online database at the Billy Ireland Library & Cartoon Museum at Ohio State University.
http://osucartoons.pastperfectonline.com/
Numerical data on comic book sales is available on ComicChron. Between 1964 and 1965, what was the top-selling Marvel comic? Was it Spider-Man? The Fantastic Four? Neither title even appears in the list, and I suspect this is an error of omission.
https://www.comichron.com/yearlycomicssales/postaldata/1965.html
From 1965 to 1966, Spidey and the FF suddenly loomed large, and the relative rankings of Superman and Batman made a big swap. That was THE time when comic books and fandom exploded, bringing me along with it, thanks to the Batman TV show.
https://www.comichron.com/yearlycomicssales/postaldata/1966.html