I am in the process of putting together etexts of my mother's books, several of which are set in the 1930s, and while there isn't anything that bad, there's stuff like a girl saying she wants to be a missionary and teach "natives," and there's a peculiar joke about the Ku Klux Klan (kids in ghost costumes gather for Halloween and one of their fathers says sardonically, "Welcome to the Ku Klux Klan," which I am guessing is a joke my grandfather actually made). I remember having to ask my mother what the Klan was, and she said she regretted putting that in due to young readers not having context. I am definitely putting in an introduction, but am not sure whether to resort to footnoting stuff like this, or what.