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U.S. Copyright is a little more subtle that just pre or post 1923. For anything published up to 1963 (4?), the copyright had to be renewed after 28 years. If it wasn't renewed, the copyright expired. Unforunately, there is no web repository of copyright information to check against. You have to go to Washington and search the archives.
(Hmm.....maybe a sideline for P.G.?)
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