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- Anderson, Sherwood, 1876-1941, author.1
- Andrews, John, 1736-1809.1
- Andrews, Mary Raymond Shipman, 1860-1936.1
- Another Mother for Peace (Association)1
- App, Austin J. (Austin Joseph), 1902-3
- Appleby, Paul H. (Paul Henson), 1891-1963.1
- Aptheker, Herbert, 1915-2003.1
- Armstrong, Donald B. (Donald Budd), 1886-1
- Arnez, Nancy Levi, 1928-1
- Arnold, Oren.1
- Arnold, Pauline, 1894-1974.1
- Ashley, James Mitchell, 1824-1896.1
- Ashton, Leonora Sill.1
- Asia House Gallery.1
- Association of American Railroads.1
- Association of American Railroads. Bureau of Railway Economics.1
- Association of American Railroads. Railroad Committee for the Study of Transportation.1
- Atlantic States Legal Foundation, Inc.1
- Atwood, David.1