- A.M. Simon Co.6
- A.M. Simon Company2
- A.S. Aloe & Co. Schwartze, Heimann Hugo Rudolf 1837-19101
- A.S. Aloe Co., Germany1
- A.S. Aloe Company, St. Louis, Missouri3
- A.S. Johnson, Jr.3
- A.S. Rainey9
- AB Springs, WM C Black, JW Rawlinson, Jas N McElwee, Jr., William A Moore , Benj. R Clyburn
1
- ACE Basin National Research Reserve1
- AECOM (Firm)1
- AFL-CIO1
- AFL-CIO Committee on Political Education4
- ALF-CIO News1
- AMP Inc.1
- AMP Inc., Harrisburg, Pennsylvania1
- AR Antoninianus1
- AR Antoninianus (Post-Reform)1
- AR Argenteus1
- ARCADIS U.S., Inc.22
- AT & T (Firm)9