The Rosenbach of the Free Library of Philadelphia is located within two 19th-century townhouses at 2008 and 2010 Delancey Place in Philadelphia. The historic houses contain the collections and treasures of Philip Rosenbach and his younger brother Dr. A. S. W. Rosenbach. The brothers owned the Rosenbach Company which became the preeminent dealer of rare books, manuscripts and decorative arts during the first half of the 20th century. Dr. Rosenbach in particular was seminal in the rare book world, helping to build libraries such as the Widener Library at Harvard, The Huntington Library and the Folger Shakespeare Library.
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