Collection
- Handy family papers, 1670s-1980s1
- Hemenway family collection, 1819-1927 (majority within 1828-1881)1
- Henry Clinton papers, 1736-18501
- Hoit family papers, 1803-1918 (majority within 1803-1873)1
- Horace Miner collection, 1941-1992 (majority within 1941-1945)1
- Hudson's Bay Company papers, 1775-1914 (majority within 1775-ca. 1790)1
- Isaac Bullock annotations and excerpts in The Poetical Works of Alexander Pope, 18371
- Jared Sparks collection, 1825-18601
- John E. Boos collection, 1860-1988, 20051
- John Egan Rapp collection, 1862-18921
- John H. Griffith collection, 1942-1972 (majority within 1942-1945, 1951-1952)1
- John and Charles Francis collection, 1869-ca. 19051
- Joseph K. and George C. Wing collection, 1863-1930 (majority within 1863-1864, 1872-1924)1
- Katharine Prest scrapbook, 1930-1954 (majority within 1941-1945)1
- Laurence Barrett family papers, 1902, 1937-2004 (majority within 1938-1945)1
- Leslie W. Quirk and Walker H. Mills correspondence, 1926-19311
- Richard Washington notes, Written in Daniel Fenning's A New System of Geography, 1771-17901
- Robert M. Vogel Collection of Historic Images of Engineering & Industry, ca. 1850s-2004 (majority within ca. 1850s-1900)1
- Russell A. Alger family papers, 1842-1975 (majority within 1863-1865, 1888-1945)1
- S. Weir Mitchell collection, 1877-19011