- Arenac County Road Commission1
- Arizona Bureau of Mines & U.S. Geological Survey1
- Armena Portland (Portland, Or), 19251
- Armour and Ramsay (Montréal)1
- Army Air Service (Washington, D.C)1
- Army Corps Of Engineers1
- Army Map Service (U.S.)1
- Army Map Service, Corps of Engineers, Department of the Army1
- Army Map Service/Panama Canal Dept.1
- Arrowsmith (London)1
- Arrowsmith Litho (London)1
- Arthur M. Hovey1
- Artillery School (Fort Monroe, Va)1
- Asher & Adams (New York), 18721
- Asher & Adams (New York), 18731
- Asher & Adams (New York), 18741
- Asher & Adams (New York), c1872.1
- Aspioti-Elka (Salonique)1
- Associated Billposters & Distributors Pro. Co.1
- Atar (Genéve)1