The dates are complicated by the changes in copyright law: once something goes into PD, it remains there, even if the term of copyright changes.
In the US, anything published before 1923 is in public domain.
Works published between 1923 and 1963 may or may not be in public domain. If the copyright was renewed, they’re still under copyright. If they were published without a legal copyright notice, they’re in the public domain. You’d have to look up the work and see if it’s still under copyright.
Anything published between 1963 and 1977 is still under copyright unless there was no legal copyright notice. Most likely, there was, so you can figure these are copyrighted.
1978 or later is copyrighted.
See this for information.