- Arctic Climate System (ACSYS)35
- Arkema, Katie3
- Armstrong, Andrew2
- Armstrong, Jake H.18
- Arndt, Raymond E.10
- Arnold, T. J. (Thomas Jefferson), d. 18781
- Arrowsmith, Aaron, 1750-18231
- Arrowsmith, John, 1790-187310
- Arrowsmith, Samuel, -18392
- Association of Bay Area Governments1
- Aucott, Paula6
- Azerbaijan. State Committee Land and Cartography14
- Bahrain. Survey and Land Registration Bureau. Topographic Survey Directorate7
- Baldwin Group1
- Baldwin, E. D.1
- Baltenweck, I.2
- Barlow, sculp.1
- Barrett Diversified1
- Bartholomew, J. G. (John George), 1860-19204
- Bartlett, Washington A1
