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Each type of file contains all of the data elements provided in the hathifiles, as well as catalog and item URL fields. The JSON file also includes metadata about the collection itself, such as when it was created. It can be used to create a workset in the HathiTrust Research Center portal.
You can find out more about how to create a workset on the HathiTrust Research Center website. To find out more about HathiTrust Data Resources in general, please see this page on our website.
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