This work (Letter from Felix Adler to Charles Delisle Burns, 13 September 1927, by Felix Adler), identified by Humanist Library and Archives, is free of known copyright restrictions.
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Licenced for digitisation by the Intellectual Property Office under Orphan Works Licence OWLS000075-17.
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Licenced for digitisation by the Intellectual Property Office under Orphan Works Licence OWLS000075-20.
Licenced for digitisation by the Intellectual Property Office under Orphan Works Licence OWLS000075-21.