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Roy Erickson - Public Domain
original uploader - Public Domain
US Government Printing Office (Washington, DC), publisher. - Public Domain
J.J. Frey - Public Domain
Data about W. G. Helsby - Public Domain
Abraham Bosse (c1602-1676), Claude Mellan (1598-1688). - Public Domain
Astridx - CC BY-SA 4.0
Public Domain
Keith Allison - CC BY-SA 2.0
Unknown military photographer - Public Domain
Joost Evers / Anefo - CC BY-SA 3.0
Pennsylvania Railroad. - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
United States Senate Historical Office - Public Domain
Innaresting - CC BY-SA 4.0
unknown - Public Domain
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Wood, J. T. (John Turtle), 1820 or 1821-1890
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Roy Erickson - Public Domain
Csonka, Larry
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original uploader - Public Domain
Palmer, Potter
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US Government Printing Office (Washington, DC), publisher. - Public Domain
Harmon, Randall S., 1903-1982
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Shaw, Guy Loren, 1881-1950
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Levin, Shalom
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Carr, Emily, 1871-1945
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Robertson, J. Ross (John Ross), 1841-1918
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J.J. Frey - Public Domain
Wild, James (British architect, 1814-1892)
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Data about W. G. Helsby - Public Domain
Alberdi, Juan Bautista, 1810-1884
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Abraham Bosse (c1602-1676), Claude Mellan (1598-1688). - Public Domain
Howell, James, 1594?-1666
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Astridx - CC BY-SA 4.0
McCormack, Mike, 1965-
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Public Domain
Light, William, 1785?-1839
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Moore, Daniel Killian, 1906-1986
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Keith Allison - CC BY-SA 2.0
Shepard, Bert, 1920-2008
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Unknown military photographer - Public Domain
Yarborough, William P., 1912-2005
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Wood, Grant, 1891-1942
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Joost Evers / Anefo - CC BY-SA 3.0
Schumann, Maurice
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Jones, Absalom, 1746-1818
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Seligmann, Jacques, 1858-1923
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Morrison, Grant
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Luceño, Tomás, 1844-1931
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Pennsylvania Railroad. - Public Domain
Clement, Martin W. (Martin Withington), 1881-1966
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Mathew Brady Levin Corot Handy - Public Domain
Stevens, Thaddeus, 1792-1868
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United States Senate Historical Office - Public Domain
McRoberts, Samuel, 1799-1843
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Kreyberg, Leiv, 1896-
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Innaresting - CC BY-SA 4.0
Schwabacher, Ethel, 1903-1984
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Emerson, Charles Wesley, 1837-1908
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unknown - Public Domain
La Follette, Fola, 1882-1970
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Menken, Adah Isaacs, 1835-1868