The Darlingtons were prominent members of Pittsburgh society and avid collectors of Americana. William Darlington, an attorney, began the collecting of maps, books, and other documents; his children continued the practice until 1918 when Edith Darlington Ammon and her sister Mary O'Hara Darlington made the first donation of 11,000 volumes to the University of Pittsburgh. A second donation of material followed in 1925.
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