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- Abbott, Edith and Grace. Papers
- ACT UP Chicago. Records
- Adkins, Arthur. Papers
- Adler, Mortimer J.. Papers
- Aeckern, Georg Christoph von. Receptenbuch
- Aethicus Ister. Aethici Philosophi Schytae Cosmographia
- Ahlfeld, Johann Friedrich. Collection of Drawings of Medical Deformities
- Aichinger, Wolff. Rezeptbϋcher
- Albert, Allen D., Reports on World's Fairs
- Aldis, Mary Reynolds. Papers
- Allee, Warder Clyde. Papers
- Allgemeine Pathologie
- Allison, Samuel King. Papers
- Altrocchi, Rudolph. Papers
- Alvarez, Geraldine. Papers
- American Baptist Education Society. Records
- American Institute of Sacred Literature. Records
- American Journal of Theology. Records
- American Neurological Association. Records
- American Recipes
- American Standard Bible Committee. Records
- Ames, Edward Scribner. Papers
- Ames, Polly Scribner. Papers
- Ames, Van Meter. Papers
- Anania, Michael. Papers
- Anderson, C. Arnold. Papers
- Anderson, Charles B. Fake Books. Collection
- Anderson, William H. and the Anti-Saloon League. Papers
- Andral, Gabriel. Cours de Pathologie Interne
- Archaismus Graphicus ab Henrico Spelmanno Conscriptus in Usum Filibrum Suorum
- Archicofradía del Santísimo Sacramento y Caridad. Records
- Ardrey, Robert. Papers
- Arnett, Trevor. Papers
- Arnoux, Hippolyte, Canal du Suez
- Asher, Louis E.. Papers
- Association for the Psychophysiological Study of Sleep Records
- Association of Cambridge Scientists. Records
- Association of Los Alamos Scientists. Records
- Association of Oak Ridge Engineers and Scientists. Records
- Association of Pasadena Scientists. Records
- Association of Scientists for Atomic Education. Records
- Astrophysical Journal. Records
- Atomic Scientists of Chicago. Records
- Atomic Scientists. Miscellaneous Records
- Atomic Scientists' Printed and Near-Print Material. Records
- Audubon, John James. Letter
- Austiefungen in der Nordsee bei Juist, Langeoog & Spiekeroog
- Austrian, Celia and Delia. Papers