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Copyright Term and the Public Domain in the United States © 2004-8 Peter B. Hirtle. Last updated 10 January, 2008. - http://www.copyright.cornell.edu/public_domain/
The 3rd edition of A Framework of Guidance for Building Good Digital Collections (produced by the National Information Standards Organization (NISO) Framework Working Group, with the generous support of the Institute of Museum and Library Services (IMLS)) - http://www.niso.org/publications/rp/framework3.pdf