As of July 6th, APS offices are open to staff and invited visitors. The Society will remain closed to the public until further notice. Library & Museum staff now have access to our collections and will respond to reference and photoduplication requests as soon as possible. However, please note that response times may be delayed due to increased demand. The Society will continue a robust slate of virtual programs throughout the fall. Read more about virtual programming and resources that can be accessed remotely. For further information on the APS reopening and its COVID response, please click here.

Use the APS Library

The American Philosophical Society Library is an international center for research with specialties in the history of the sciences, early American history, Native American ethnography and linguistics, and digital innovation.

With roots extending back to the founding of the Society in 1743, the Library of the American Philosophical Society houses over thirteen million manuscripts, 350,000 volumes and bound periodicals, 250,000 images, and thousands of hours of audio tape. The Library's holdings make it among the premier institutions for documenting the history of the American Revolution and Founding, the study of natural history in the 18th and 19th centuries, the study of evolution and genetics, quantum mechanics, and the development of cultural anthropology, among others.

Notable manuscript collections include the papers of Benjamin Franklin, the Journals of Lewis and Clark, a large corpus of Charles Darwin correspondence and printed material, the records of pioneering anthropologists , the holdings of the Eugenics Records Office, and the papers of seven Nobel Laureates.

Among the many extraordinary books are first editions of Sir Isaac Newton's Principia, Charles Darwin's Origin of Species, a presentation copy of Thomas Jefferson's Notes on the State of Virginia, the elephant folio of Audubon's Birds of North America (for which the APS was an original subscriber), as well as a majority of Benjamin Franklin imprints and a significant portion of Franklin's personal library.  

From the blog