- A. White & Co. (1)
- A.B. Graham Co., Photo-Lithographers (Washington, D.C) (2)
- A.B. Graham Photo. Lith (Washington, D.C) (1)
- A.C. Armstrong & Son (New York), 1882 (1)
- A.C. McClurg (Chicago) (1)
- A.E. Akerson; Lindstrom, Minnesota 1913 (1)
- A.H. Anderson (Redwood Falls, Minnesota), 1898 (1)
- A.J. Johnson (New York), 1865 (1)
- A.J. Johnson (New York), 1869 (1)
- A.K. Pavellas & Co. (San Francisco, California) (1)
- A.L. Bancroft & Co (San Francisco) (1)
- A.L. Bancroft & Co. (San Francisco) (1)
- A.M. Robertson (San Francisco), 1927 (1)
- A.M. Smith (Minneapolis, Minn.) (1)
- A.S. Barnes (New York) (3)
- A.S. Barnes (New York), 1877 (1)
- A.S. Barnes (New York), 1886 (1)
- A.T. Goodrich (New York) (1)
- ACT UP (1)
- AIDS Project Los Angeles (1985) (1)
