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The Lincoln mss., ca. 1798-1959, consist of letters, documents, and facsimile copies of documents by and about Abraham Lincoln, 1809-1865, his ancestors, immediate family, members of his cabinet, and other persons closely connected with him.

The McCulloch mss., 1766-1914, consist of letters and papers of Hugh McCulloch, 1808-1895, U.S. Comptroller of the Currency, Secretary of the Treasury, and a partner in the London banking house of Jay Cooke, McCulloch & Company.

The Williams, K.P. mss., 1820-1958, consists of letters and papers of Kenneth Powers Williams, 1887-1958, professor of mathematics at Indiana University and author of Lincoln Finds a General.