This work is licensed under CC BY-SA 4.0
Works within the Public Domain are not copyrighted but rather belong to all of us.
Works enter the Public Domain by aging out of copyright or when authored by the federal government. The resources below contain health sciences works that reside in the Public Domain:
Works from 1929 and earlier are in the public domain as well as sound recordings from 1924 and earlier!
Public Domain Day 2025 Montage by Jennifer Jenkins, CC-BY 4.0