- N. B. White Letter to Darius White1
- N. Cairns Letter to Hugh McCalmont2
- N. Chester Sorensen Letter to Frank Lloyd Wright2
- N. F. McNorton Record of Whiskey Dispensed1
- N. J. Pittman Account Book1
- N. L. Michael Letters,2
- N. S. Andrews Letter1
- N.R.A. Roller Hockey Club (Allentown, Pa.) Minutes2
- NASA Collection10
- Nack, Kenneth. Artist file: miscellaneous uncatalogued material1
- Nadar, Félix, 1820-1910. Artist file: miscellaneous uncatalogued material1
- Nadelman, Elie, 1882-1946. Artist file: miscellaneous uncatalogued material1
- Nadler, Harry, 1930-1990. Artist file: miscellaneous uncatalogued material1
- Nagano, Shozo. Artist file: miscellaneous uncatalogued material1
- Nagare, Masayuki, 1923-. Artist file: miscellaneous uncatalogued material1