Image from Wikimedia Commons
U.S. Government Printing Office. - Public Domain
unknown - Public Domain
National Photo Company - Public Domain
Gateman1997 - CC BY-SA 3.0
Thomas Child - Public Domain
w:Robert Walker (painter) - Public Domain
w - Public Domain
Photographie Otto à Paris - Public Domain
Ralph Townsend - Public Domain
W. Woodford Clayton, author. Everts & Peck (Philadelphia, PA), publisher. - Public Domain
Foto tomada en 1923, a causa del tiempo transcurrido no debería tener derechos de autor, además de ser una foto casera - Public Domain
Vangeliste, engraved after a painting by Richard Brompton - Public Domain
George Armstrong/FEMA - Public Domain
Gaetano Vascellini - Public Domain
Tom Marcello - CC BY-SA 2.0
Paolo Domenico Finoglia - Public Domain
Image from Wikimedia Commons
Kuffler, Stephen William 1913-1980
Image from Wikimedia Commons
Norbeck, Peter, 1870-1936
Image from Wikimedia Commons
U.S. Government Printing Office. - Public Domain
Allen, Amos L. (Amos Lawrence), 1837-1911
Image from Wikimedia Commons
unknown - Public Domain
Smit, Leo, 1900-1943
Image from Wikimedia Commons
unknown - Public Domain
Ptolemy, active 2nd century
Image from Wikimedia Commons
National Photo Company - Public Domain
Stapf, O. (Otto), 1857-
Image from Wikimedia Commons
Beam, Jacob D., 1908-....
Image from Wikimedia Commons
Gateman1997 - CC BY-SA 3.0
Brown, Clancy
Image from Wikimedia Commons
Hertz, Heinrich, 1857-1894
Image from Wikimedia Commons
Weyr, Emil, 1848-1894
Image from Wikimedia Commons
Thomas Child - Public Domain
Phips, William, Sir, 1651-1695
Image from Wikimedia Commons
w:Robert Walker (painter) - Public Domain
Walker, Robert, 1607-1658?
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Fletcher, John, 1579-1625
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Green, William, 1870-1952
Image from Wikimedia Commons
w - Public Domain
Hyde, Annie T. (Annie Taylor), 1849-1909
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Gehrig, Lou, 1903-1941
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Kiefer, Hermann 1825-1911
Image from Wikimedia Commons
Photographie Otto à Paris - Public Domain
Morès, Antoine Amédée Marie Vincent Manca de Vallombrosa, marquis de, 1858-1896
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Oshkosh, Chief, 1795-1858
Image from Wikimedia Commons
Ralph Townsend - Public Domain
Townsend, Ralph, 1900-1976
Image from Wikimedia Commons
unknown - Public Domain
Baer, George F. (George Frederick), 1842-1914
Image from Wikimedia Commons
W. Woodford Clayton, author. Everts & Peck (Philadelphia, PA), publisher. - Public Domain
Clapp, Asa W. H. (Asa William Henry), 1805-1891
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Spence, Basil, Sir, 1907-1976
Image from Wikimedia Commons
Foto tomada en 1923, a causa del tiempo transcurrido no debería tener derechos de autor, además de ser una foto casera - Public Domain
Ri︠a︡zanov, D. B.
Image from Wikimedia Commons
Vangeliste, engraved after a painting by Richard Brompton - Public Domain
Mylne, Robert, 1734-1811
Image from Wikimedia Commons
Savigny, Friedrich Karl von, 1779-1861
Image from Wikimedia Commons
George Armstrong/FEMA - Public Domain
Barbour, Haley, 1947-
Image from Wikimedia Commons
Gaetano Vascellini - Public Domain
Doni, Gio. Battista (Giovanni Battista), 1593 or 1594-1647
Image from Wikimedia Commons
Tom Marcello - CC BY-SA 2.0
Hart, Billy
Image from Wikimedia Commons
Paolo Domenico Finoglia - Public Domain
Finoglia, Paolo Domenico, approximately 1590-1645?