The images of documents from the Archives of the Pontifical Gregorian University provided by the Kircher Correspondence Project may be copied, downloaded and printed for individual scholarly use. They may not be used for commercial purposes. Authors wishing to use small numbers of images from the site to illustrate scholarly publications may do so providing they write "Courtesy of the Kircher Correspondence Project", and cite the general URL of the project at least once in the article or scholarly work.
Scholarly use of information contained in the site should also acknowledge the Kircher Correspondence Project and give the general URL of the project. Citations of particular letters or documents should specify the unique Title-ID of the document given in the document data
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