I have to find ones that are in the public domain and available to stream on YouTube, which narrows my selection down quite a bit. I'm not going to find any Clark Gable or Jean Harlow films in those parameters.
I ended up watching one called Young Bride from 1932. The opening scene takes place in a library, so I was interested in watching more. There's even a funny little aside in which a male patron comes in asking for an illustrated copy of Aphrodite. Upon hearing his request, the female library paige gasps and covers her mouth as she scurries on with her cart; the spinster librarian replies that the book is not currently in publication. After a bit of research, I found out that this is referencing Pierre Louys' Aphrodite: moeurs antiques, published in 1896. The book was banned in 1929 by the United States Customs Bureau for being "lewd, corrupting and obscene," probably due to the lesbian relationships and "unrestricted sensuality among women."
From there, we cut to the children's room, where a pretty women is showing a miniature village to two children, and pointing out where all the fairytale characters such as Rapunzel and Peter Pan live.
So far the movie contained a library, banned books and a children's librarian who loves fairy tales and miniature renderings of them.
WHY DID I NOT KNOW ABOUT THIS MOVIE UNTIL NOW?!?!?!?!