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unknown - Public Domain
Neruda50 - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
unknown photographer - Public Domain
as cited RVD (although unlikely because it did not exist at the time) - Public Domain
Civil War Photograph Collection, Library of Congress - Public Domain
John Payne - Public Domain
X-PRIZE - CC BY 2.0
unknown painter - Public Domain
Petra Kozlová - CC BY-SA 4.0
:en:United States Court of Appeals for the Ninth Circuit - Public Domain
anonymous - Public Domain
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unknown - Public Domain
Gregory, Charles Hutton, 1817-1898
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Neruda50 - Public Domain
Carrera Andrade, Jorge, 1903-1978
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Mathew Brady Levin Corot Handy - Public Domain
Bayard, James A. (James Asheton), 1799-1880
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Vargas, Alberto, 1896-1982
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unknown - Public Domain
Davis, Henry Gassaway, 1823-1916
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unknown photographer - Public Domain
Sigerson, George, 1839-1925
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Bodley, Thomas, Sir, 1545-1613
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German, Edward, 1862-1936
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as cited RVD (although unlikely because it did not exist at the time) - Public Domain
Van Raalte, Albertus C. (Albertus Christiaan), 1811-1876
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Zamenhof, L. L. (Ludwik Lazar), 1859-1917
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Civil War Photograph Collection, Library of Congress - Public Domain
Hatch, Edward, 1832-1889
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Wilbraham, Roger, 1553-1616
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John Payne - Public Domain
Broughton, Hugh, 1549-1612
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Fitzgerald, Edward, 1809-1883
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Summers, John W. (John William), 1870-1937
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Guilleminot, Armand-Charles, 1774-1840
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Warren, John Byrne Leicester, baron de Tabley, 1835-1895
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Kendall, Edward C. (Edward Calvin), 1886-1972
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X-PRIZE - CC BY 2.0
Brooks, Avery
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Bradley, Lisa, 1951-
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McCarthy, Charles, 1873-1921
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unknown painter - Public Domain
Trask, Katrina, 1853-1922
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Elliotson, John, 1791-1868
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Petra Kozlová - CC BY-SA 4.0
Belting, Hans
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Nicolini, Ernest, 1834-1898
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Hevelius, Johannes, 1611-1687
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:en:United States Court of Appeals for the Ninth Circuit - Public Domain
Burgess, Franklin Douglas, 1935-2010
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Highsmith, Carol M., 1946-
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Collier, John, 1850-1934
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anonymous - Public Domain
Molteno, James, Sir, 1865-