The longest-living author of this work died in 1982, so this work is in the public domain in countries and areas where the copyright term is the author's life plus 40 years or less. As this work's copyright was not renewed, it entered the public domain on 1 January 1982. at least 27 years after they were first published/registered but not later than 31 December in the 28th year. Works published in 1953 would have had to renew their copyright in either 1980 or 1981, i.e. See also the Rutgers copyright renewal records for further information.For all records since 1978, search the U.S.For other renewal records of publications between 1922–1950 see the University of Pennsylvania copyright records scans.For Class A renewals records ( books only) published between 19, check the Stanford University Copyright Renewal Database.
This work is in the public domain in the United States because it was legally published within the United States (or the United Nations Headquarters in New York subject to Section 7 of the United States Headquarters Agreement) before 1964, and copyright was not renewed.
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