375 works carry all of these threads.
Brady & Co. · 1865
Unidentified Artist · c. 1865
Carleton E. Watkins, 11 Nov 1829 - 23 Jun 1916 · c. 1870
Unidentified Artist · c. 1861-65 (after earlier photograph)
José María Mora, c. 1847 - 18 Oct 1926 · c. 1880-85
Unidentified Artist · 1861
John Carbutt, 2 Dec 1832 - 28 Jul 1905 · c. 1870
B. W. Kilburn, active c. 1891 · 1891
Pach Brothers Studio, active 1867 - 1993 · c. 1880
Kilburn Brothers, active 1865 - 1909 · c. 1890
Goodwin & Company · 1887
Lewis E. Walker, 1822 - 1880 · 1877
Louis de Clercq · 1860 or later
Philp & Solomons, active 1860s · c. 1865