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J. Henry Lea; John R. Hutchinson - Public Domain
US Government Printing Office. - Public Domain
Unknown photographer of the Signal Corps - Public Domain
Gorupdebesanez - CC BY-SA 3.0
Public Domain
unknown - Public Domain
anonymous - Public Domain
Keith Allison - CC BY-SA 2.0
not stated - Public Domain
Noahashergolden - CC BY-SA 3.0
StagiaireMGIMO - CC BY-SA 3.0
unknown. If official congressional portrait, then legally the House of Representatives or Senate, depending which he was serving in at the time. - Public Domain
unbekannt; unknown - Public Domain
USV - CC BY 2.0
Pete Wright - CC BY 2.0
Mathew Brady - Public Domain
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J. Henry Lea; John R. Hutchinson - Public Domain
Lincoln, Abraham, 1744-1786
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Debus, Allen G.
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Stewart, James, Sir, 1635-1713
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Salviani, Ippolito, 1514-1572
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US Government Printing Office. - Public Domain
Tenzer, Herbert, 1905-1993
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Clay, Green, 1757-1826
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Unknown photographer of the Signal Corps - Public Domain
McCaul, V. J. (Verne James), 1903-1968
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Singer, Israel Joshua, 1893-1944
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Gorupdebesanez - CC BY-SA 3.0
Kaufman, Philip, 1936-....
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Holberg, Ludvig, 1684-1754
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Shaw, Artie, 1910-2004
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Public Domain
Locke, Joseph, 1805-1860
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unknown - Public Domain
André, Johann Anton, 1775-1842
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anonymous - Public Domain
Negri, Francesco, 1623-1698
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Keith Allison - CC BY-SA 2.0
Brown, Dee, 1984-
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not stated - Public Domain
Call, Annie Payson, 1853-1940
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Kennedy James ? 1406-1465
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Noahashergolden - CC BY-SA 3.0
Anyon, Jean
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Bastien, Alfred, 1873-1955
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StagiaireMGIMO - CC BY-SA 3.0
Fassbaender, Brigitte
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unknown. If official congressional portrait, then legally the House of Representatives or Senate, depending which he was serving in at the time. - Public Domain
Wilson, John Lockwood, 1850-1912
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Levi-Civita, Tullio, 1873-1941
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unbekannt; unknown - Public Domain
Heis, Eduard, 1806-1877
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Iglesias, José María, 1823-1891
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USV - CC BY 2.0
Hughes, Chris, 1983-
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Younger, Cole, 1844-1916
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Laffoon, Ruby, 1869-1941
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unknown - Public Domain
Krohn, Kaarle, 1863-1933
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Pete Wright - CC BY 2.0
Caplan, Arthur L.
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Mathew Brady - Public Domain
Bagley, John Holroyd, 1832-1902