The Weismann mss., 1878-1881, consists of letters from German biologist August Weismann, 1834-1914, to French biologist Antoine Fortuné Marion, 1846-1900.
The Williams, Jonathan mss., 1738-1869, consist of letters and papers of Jonathan Williams, 1750-1815, merchant and soldier, grand-nephew of Benjamin Franklin and first superintendent of the U.S. Military Academy at West Point.
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.