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Hi Jan -
It looks like UCLA has both the McKinley Papers https://catalog.library.ucla.edu/vwebv/holdingsInfo?bibId=2221411 and the Harrison Papers https://catalog.library.ucla.edu/vwebv/holdingsInfo?bibId=1578353.
It also looks like their microfilm collections are open to the general public https://www.library.ucla.edu/use/access-privileges/visit-ucla-library/services-general-public, although you may want to contact them ahead of time to confirm access.
All the best,
Manuscript Reference Librarian
Library of Congress
1 person found this helpful
Dear Ms. Dougall,
Thank you for posting your request on History Hub!
We searched WorldCat and located a listing for the Benjamin Harrison papers as well as the one for the William McKinley Papers. For more questions about these records, please contact the Library of Congress’s Manuscript Division using their Ask a Librarian inquiry form, or you may contact one of the libraries listed in the WorldCat entries.
We hope this information is helpful. Best of luck with your research!