- Is a work that you want to use in the Public Domain? Use this digital slider to find out.
- This chart “When US Works Pass into the Public Domain” by Laura Gasaway of the University of North Carolina, provides a handy overview of a complicated topic.
- “Copyright Term and the Public Domain in the US” by Peter Hirtle of Cornell is up to date as of January 1, 2009.
The following are websites which contain rich repositories of public domain materials.