Although most of this large collection consists of papers of Lewis's legal practice, there are important groups which relate to the furnishing and maintenance of his city and country houses and the management of his farm, to the assembling of his outstanding collections of Asian and medieval illuminated manuscripts and of Babylonian clay tablets (now at the Free Library of Philadelphia), and to institutions with which he was closely associated, such as the American Philosophical Society, the University of Pennsylvania, and the Pennsylvania Academy of Fine Arts. Many letters and papers are about business (mortgages, rents, directorships in banks and insurance companies, and investments) and about the social and cultural life of Philadelphia (operas, libraries, museums, and schools for the handicapped).

From Massachusetts Historical Society. Papers of John Adams, John Quincy Adams, Charles Francis Adams, their wives, children, and others.

A collection of letters, legal papers and financial records of three generations of the prominent Philadelphia family. Spanning 1745-1955, detailed are the legal cases and political advocacy work of John Kintzing Kane (1795-1858), Robert Patterson Kane (1827-1906), and Francis Fisher Kane (1866-1955). Also includes correspondence, architectural drawings, and photograph albums of the Cope family. Robert Patterson Kane's daughter Eliza Middleton Kane (1863-1952) married the Philadelphia architect Walter Cope (1860-1902) in 1893. The APS papers of Elisha Kent Kane are in call no. B K132.