Other options for finding archival materials:
(the information on this page is taken from the Society of American Archivists' Using Archives: A Guide to Effective Research - https://www2.archivists.org/usingarchives)
Follow usage guidelines. In general that means:
Even if you have a good sense of what you're looking for you should still ask archival staff what they have in your subject area.
Quaker & Special Collections, Haverford College
Special Collections at Haverford has materials that support a wide range of research. Thesis writers should search Special Collections holdings for their topic and then contact Sarah Horowitz about using materials from the collections.
Special Collections, Bryn Mawr College
Special Collections librarians welcome researchers from Haverford. E-mail or phone Marianne Hansen or Eric Pumroy to tell them your research needs before going over to Bryn Mawr. Also beforehand look in particular at the collection guides and online exhibits lto get an idea of the kinds of material available for research:
Books on London
French Revolution Pamphlets
Consortium for History of Science, Technology and Medicine Special Collections Search
This group of 22 libraries and scholarly societies promotes research in the history of science. Their collections, many located in the Philadelphia area or East Coast cities, are available for you to use when making an on-site research trip. Use this federated search to see what kinds of materials in your subject area are available.
Historical Society of Pennsylvania
HSP was founded in 1824 and has rich holdings in manuscripts, Pennsylvania and Philadelphia history, and ethnic studies.
Rare Book and Manuscript Library, Van Pelt Library, University of Pennsylvania
The Rare Book and Manuscript Library houses rich holdings including the Henry Charles Lea collection of Inquisition documents and Early Modern books in philosophy and social thought.
Urban Archives, Temple University
"The Urban Archives was established in 1967 to document the social, economic, and physical development of the Philadelphia area from the mid-19th century to the present."- Website
Before you book a trip to an archive, make sure there is no other way for you to access the materials you're interested in: