All Names
- A. Brown & Co. (2)
- A. Gawthrop & Co. (2)
- A. Hoen & Co. (2)
- A. Judson & Co. (3)
- A.P. Critchlow & Co.
- Abbott, J. H., active 1860-1879 (14)
- Abbott, William H., 1838-1898
- Abels, C. W.
- Acme Newspictures (New York, N.Y.)
- Adams Gallery (Worcester, Mass.)
- Adams, Albert, approximately 1873-1946
- Adams, John Wolcott, 1874-1925 (6)
- Adams, K. (Kilburn), approximately 1857-1905
- Addis, R. W. (Robert W.), -1874 (57)
- Alcan & Corbutt
- Alden Photograph Company
- Alden, Augustus Ephraim, 1837-1914 (2)
- Aldrich, Henry B., 1833-1890
- Alfred Whital Stern Collection of Lincolniana (Library of Congress) DLC (2)
- Allen, A. M. (Amos Morrel), 1823-1900 (2)
- Allen, E. L. (Edward Lowe), 1830-1914
- Allen, Edward L., 1830-
- Allen, Edwin K.
- Allen, W. H. (William H.)
- Allgower, Charles F., 1837-1903
- Allison, William Merle, 1880-1934
- Alschuler, S. (Samuel G.), 1826-1882
- American Bank Note Company
- American Bank Note Company.
- American Card Company.
- American Phototype Company
- American Press Association.
- American Sunday-School Union
- American Tract Society
- Amey & Lemer (2)
- Anderson & Blessing (6)
- Anderson & Turner (17)
- Anderson Gallery (Richmond, Va.) (3)
- Anderson, C. H.
- Anderson, D. H. (David H.), 1827-1905 (15)
- Anderson, Edward H., approximately 1832- (2)
- Anderson, H. (Hugh S.)
- Anderson, Joseph H.
- Anderson, Samuel, 1825- (16)
- Anson, Rufus (5)
- Apeda Studio (New York, N.Y.) (2)
- Apple, G. W. (George Washington), 1846-1913
- Applegate, James R., 1828-1913
- Arcade Gallery (Providence, R.I.)
- Armstead & Taylor (3)
- Armstead & White (11)
- Armstead, G. W. (3)
- Armstrong, W. H., approximately 1831-
- Ashmead, Henry Buckley
- Atwood's (2)
- Aull, J. R. (John R.) 1827-1885 (2)
- Austen, Samuel, 1827-1895
- Averill, H. K., Jr. (Henry Ketchum) (8)
- Avery's Gem Gallery (Albany, N.Y.)
- Avery, A. S., (Asahel Stevens), 1822-1902 (2)
- Ayer, George F.
- Ayres, George B.
