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In the case of third party correspondence and manuscript collections, the museum often has property rights, but not copyright, to letters, photographs, sound recordings, and other materials. Authorization to publish or quote from manuscripts must be requested from the owner of the copyright (often the heirs, estate, or literary executor). It is the responsibility of the researcher to obtain permission from all copyright holders before publication.
The template for citing our archival materials is:
[Item identification and date], [Series info.], Record/paper name, Philadelphia Museum of Art, Library and Archives.