- A Food Map of the United States Showing the Part Played by Each of Our States in Supplying the Nation's Larder, 19321
- A. J. Davis Family Collection, 1874/2007, bulk 1874/19071
- Adam Finch Collection, 1891/19331
- Agricultural Extension Service Records, 1914/19801
- Al Gross Papers, 1909/20001
- Albert L. Sturm Papers, 1904/19881
- Albert M. Brown Collection, 1930/19381
- Alberta Pfeiffer Architectural Collection, 1929/19761
- Alfred C. Payne Collection, 1917/20031
- Alfred W. Lawson Collection, 1913/19481
- Allan Hines Reid Landscape Gardening Radio Talks,, 1932/19331
- Alleghany Chapter, National Society of the Daughters of the American Revolution Records,, 1890/20221
- Ambrose L. Snavely Papers, 1903/19521
- Ann A. Hertzler Collection, 1863/2013, bulk 1974/20001
- Ann Eve Moss Papers, 1920/19901