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It is today one of the world's major natural science research facilities.
The Castle Collection includes works in botany and ornithology.The APS has played an important role in the cultural life of the nation for nearly two-and-one-half centuries and has been particularly prominent in support of the sciences.The Society first began acquiring books and manuscripts in the 1770s, and today its Library is one of the principal institutions in the United States for study of the history of science.Hours: The collections are available for research Monday through Friday from 9am to 5pm.Materials will not be pulled after pm on any given day. To make a research appointment, contact Theresa Altieri at 215-587-5568 or [email protected] Abraham Lincoln Foundation of The Union League of Philadelphia (ALF) is the steward of an important collection of art, archives, manuscripts, books, pamphlets, objects and other historic documents related to both the Union League and the Civil War.
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Additional collections of books related to American and European history, World Wars I and II, regional history, biographies and early 20th century travel are also available.