509 works carry all of these threads.
The Ritz Studio · c. 1895
Gurney & Son, 1860 - 1874 · c. 1876
J. F. Coonley, 1832 - 1915 · c. 1860-70
Mathew B. Brady, 1823? - 15 Jan 1896 · 1871
Henry Ulke, 29 Jan 1821 - 17 Feb 1910 · c. 1865
Henry Hamilton Bennett, 1843 - 1908 · 1887
Alexander Gardner, 17 Oct 1821 - 10 Dec 1882 · 1865
Mathew Brady Studio, active 1844 - 1894 · 1863
George Newbold, active 1860s · 1860
Matthew Boulton · ca. 1770
Mathew B. Brady, 1823? - 15 Jan 1896 · c. 1863
José María Mora, c. 1847 - 18 Oct 1926 · c. 1880-85
Pach Brothers Studio, active 1867 - 1993 · c. 1880
Bell & Brother, active 1865 - 1875 · 1869
George Gardner Rockwood, 12 Apr 1832 - 10 Jul 1911 · c. 1860
Peter A. Juley & Son, active 1896 - 1975 · 1930
