The Catholic Message Board

An interesting selection of published works from 1929 and unpublished works whose author died in 1954

Some of the more prominent

Coconuts (the First Marx Brothers movie)
Popeye the Sailor Man
Tintin
"Ain't Misbehavin" classic jazz song
"Singing In the Rain" (the song, of course, not the movie)
"A Farewell to Arms" by Ernest Hemmingway
"All Quiet on the Western Front" by Erich Marie Remarque (original German only, not any English translation which came later)

In the US, at least. For those from other countries, check your own laws

https://copyrightlately.com/public-domain-2025/

This page says that the German version of All Quiet entered last year, and the first English translation enters this year.