That’s a little different than what I was thinking.

Most Tijuana bibles were obscene parodies of popular newspaper comic strips at the time, … Others made use of characters based on popular movie and sports stars of the day …

That’s more along the lines of Rule 34, or the early Simpsons “porn” that got sent by fax machine.

I was thinking of wholly original “mainstream” comics that you could just go buy at a drugstore or newsstand.