- Adams, Leon David (1905-1995). Papers. (D-304)
- Agricultural Appropriations Collection. (MC008)
- Agricultural Technology Collection: Brochures. (O-005)
- Agricultural Technology Collection: Manuals. (O-011)
- AgRISTARS/LACIE. Collection. (D-342)
- Akins, Samuel B. (1908-1990). Papers. (D-314)
- Albee Directs Albee Collection (D-131)
- Allderdice, Norman. Collection. (D-404)
- Allewelt, William F. Papers (D-532)
- Alley, Curtis. Plant Physiology Lab Book (MC268)
- Allred, Berten W. (1904- ). Papers. (MC029)
- American Association of Land Grant Colleges. Collection. (D-236)
- American Beekeeping Federation Archives. (D-074)
- American Bicyclist Records (D-472)
- Amerine, Maynard A. (1911-1998). Papers. (D-060)
- Amerson, Price. Art Exhibition Catalog Collection. (D-423)
- Amerson, Price. Papers. (D-338)
- Andersdatter, Karla Margaret. Papers. (D-049)
- Anderson Valley Advertiser Archives. (D-171)
- Andrews, Lawrence J. Papers (D-499)
- Andrews, Michael. Papers (D-577)
- Angel Island Oral History Collection (D-455)
- Angelo, Homer G. (1916-1998). Papers. (D-372)
- Annereaux, Ralph (1904-1986). Papers. (D-365)
- Apiculture Subject File Collection. (D-077)
- Apiculturists Collection. (D-076)
- Armenian Women’s Archives Collection (D-576)
- Armistead, Samuel G. Papers (D-580)
- Arnold, Hubert A. ( -1994). Papers. (D-210)
- Askine, Sibyl E. Collection. (MC034)
- Asmundson, Vigfus. Papers (D-546)
- Audiovisual Collection (O-014)
- Avant Garde Poetry Collection: Ephemera. (O-030)
- Avant Garde Poetry Collection: Posters. (O-040)
- Axe, Ruth. Papers. (MC072)
- Ayers, C. Papers. (MC018)
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