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unknown - Public Domain
No photographer named in original source. - Public Domain
*Jeff Goodman - CC BY-SA 3.0
U.S. Congress - Public Domain
United States Congress - Public Domain
Willem van de Poll - CC BY-SA 3.0
Courtesy of the w:en:Fraser_MacPherson - CC BY 2.0
w:George Grantham Bain - Public Domain
Unidentified photographer - Public Domain
www.weforum.org - CC BY-SA 2.0
Bureau of Engraving and Printing - Public Domain
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unknown - Public Domain
Togan, Ahmed Zeki Velidi, 1890-1970
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Dupin de Chenonceaux, Louise Marie Madeleine de Fontaine, 1707-1799
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Severus, Lucius Septimius, Emperor of Rome, 146-211
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Fabritius, Carel, 1622-1654
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Grove, George, 1820-1900
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Grisi, Carlotta, 1819-1899
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Ives, Halsey Cooley, 1847-1911
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Hyatt, John W. (John Wesley), 1837-1920
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Strozzi, Piero, 1510-1558
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McKelvie, Samuel Roy, 1881-1956
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Berni, Francesco, 1497 or 1498-1535
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Terry, Daniel, 1782-1829
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No photographer named in original source. - Public Domain
Curzon, Sarah Anne, 1833-1898
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unknown - Public Domain
Goodling, George A. (George Atlee), 1896-1982
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*Jeff Goodman - CC BY-SA 3.0
Goldstein, Al
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U.S. Congress - Public Domain
Lloyd, Sherman P. (Sherman Parkinson), 1914-1979
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United States Congress - Public Domain
Brownson, Charles B. (Charles Bruce), 1914-1988
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Richmond, Charles Gordon-Lennox, Duke of, 1791-1860
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Willem van de Poll - CC BY-SA 3.0
Guđmundur Finnbogason (1873-1944).
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Hooke, N. (Nathaniel), 1690?-1763
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Courtesy of the w:en:Fraser_MacPherson - CC BY 2.0
Whigham, Jiggs
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Becker, Ludwig, 1808?-1861
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Brown, T. Allston (Thomas Allston), 1836-1918
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w:George Grantham Bain - Public Domain
Marsans, Armando, 1887-1960
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Hancock, John, 1737-1793
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Unidentified photographer - Public Domain
Leroux, Xavier, 1863-1919
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www.weforum.org - CC BY-SA 2.0
ʿArafāt, Yāsir, 1929-2004
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Bureau of Engraving and Printing - Public Domain
Calle, Paul
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Seton, Elizabeth Ann, Saint, 1774-1821
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unknown - Public Domain
Roberts, George Brooke, 1833-1897