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U.S. & International Copyright Table (by Key Years)
Flow Chart for Determining Public Domain Works
From UC Berkeley's Is it in the Public Domain Handbook:
No wonder copyright is so confusing!
Note: Click on image to go to PDF so you can resize it to see each section.
Is it in the Public Domain?
A handbook for evaluating the copyright status of a work created in the United States between January 1, 1923 and December 31, 1977