Fingers crossed that it actually happens!
Until then, here is a link to a book of copyright entries for 1923: https://books.google.com/books?id=V6AhAQAAIAAJ
(Just to browse for ideas! )
The one above is just books, you can find links to the periodicals copyright book, etc at this link under the 1923 heading: https://onlinebooks.library.upenn.edu/cce/to1949.html
Suggest and discuss books to read (all languages welcome!)