Encyclopedias, Almanacs, Transcripts, and Maps
- Arbitration Act of 1888
- Arbuthnot, Marriot
- Archaeology and Archaeologists
- Archbishop Desmond Tutu
- Archbishop Oscar Romero
- Archibald Dalzel
- Architectural Styles
- Architecture: American Indian
- Architecture: Greek Revival
- Architecture: Overview
- Architecture: Parks and Landscape
- Architecture: Public
- Architecture: Religious
- Architecture: Spanish Borderlands
- Architecture: Vernacular
- Archival Collections
- Arctic and Antarctic
- Arendt, Hannah (1906–1975)
- Arents Collection
- Arete of Cyrene