http://www.copyright.cornell.edu/public_domain/
Great Chart -- Really need to see to appreciate... PDF version also available
© 2004-7 Peter B. Hirtle. Last updated 31 Octobert 2007. Use of this chart is governed by the Creative Commons Attribution-NonCommercial License 3.0 In addition, permission is granted for non-profit educational use, including but not limited to reserves and coursepacks made by for-profit copyshops.
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