Yes, that’s how it works. But most countries are signatories of the Berne Convention which sets a minimum 50-years-after-death copyright length, and have mostly

Yes, that’s how it works. But most countries are signatories of the Berne Convention which sets a minimum 50-years-after-death copyright length, and have mostly settled on 70-years-after-death. This includes the US, but it wasn’t retroactively applied, so the old 95-years-after-publishing regime remains in place for works published before 1976. That’s why these twenty works were all published in 1929.