Papers of Thorndike, consisting of correspondence, mansucripts, diaries, notes, photocopies of medieval scientific manuscripts, glass slides, books, pamphlets, and reprints. The correspondence relates to his scholarly research and publication in the field of the history of medieval science. Also, some family and personal correspondence. One half of the collection consists of photostatic copies of manuscripts Thorndike indexed in his major work, A CATALOGUE OF INCIPITS OF MEDIAEVAL SCIENTIFIC WRITINGS IN LATIN (1963), the first draft, final copy, galley proofs, related correspondence, and extensive card files of notes used in compiling the work. There is also a typescript of the 1937 edition. Thorndike's 76 volumes of personal diaries, 1902-1963, detail his daily activities, appointments, trips abroad, and lists of reading. In addition there are his other manuscripts for journal articles and book reviews.