- A. D. Handy, Stereopticons and Supplies (Boston, Ma)5
- Abbott, Harold T.140
- Acme Newspictures (New York, N.Y.)1
- Alexander, Anna Maria Washington, 1817-18501
- Alexander, Wilson Cary Selden, 1836-18591
- American Colortype Company2
- American Museum of Natural History (New York)1
- American Stereoscopic Company2
- Anderson, James, 1745-18071
- Bailey, Worth, 1908-19803
- Bain News Service1
- Baker, Reid S.1
- Bayes, William J. (William Jaqua), 1959-20211
- Beck Engraving Company20
- Bell & Bro. (Washington, D.C.)18