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Per http://onlinebooks.library.upenn.edu/cce/firstperiod.html#N the journal Natural History only started renewing copyrights from its 1927 edition forwards, and American History Novitates was unrenewed. This is from 1923, hence:
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
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