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National Magazine - Public Domain
Burton Lee Thorpe ''et al.'' - Public Domain
National Geographic Society - Public Domain
unknown - Public Domain
Studio of Michiel Jansz van Mierevelt - Public Domain
Cadmiumyellow - CC BY-SA 4.0
Public Domain
Boungawa - CC BY-SA 4.0
Nadar - Public Domain
Office of Behavioral and Social Sciences Research, OD/NIH - Public Domain
Fett - CC BY 2.0
Gage Skidmore - CC BY-SA 3.0
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Tyson, Edward, 1650-1708
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Codman, Ogden
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National Magazine - Public Domain
Murray, W. H. H. (William Henry Harrison), 1840-1904
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Wigand, Johann, 1523-1587
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Burton Lee Thorpe ''et al.'' - Public Domain
Garretson, James Edmund, 1828-1895
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National Geographic Society - Public Domain
Hayden, Edward Everett, 1858-1932
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Bruni, Leonardo, 1369-1444
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Hunter, Alberta
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Palmer, Ernest, 1885-1978
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Francisco, Peter, 1760-1831
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Boylesve, René, 1867-1926
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Gronich, Shlomo
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unknown - Public Domain
Larkin, Milt, 1910-1996
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Studio of Michiel Jansz van Mierevelt - Public Domain
Wotton, Henry, Sir, 1568-1639
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Cadmiumyellow - CC BY-SA 4.0
Bowes, David, 1957-
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Poague, William Thomas, 1835-1914
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Bause, Johann-Friedrich, 1738-1814
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Jones, Thomas, 1742-1803
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Morgan, William, 1750-1833
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Public Domain
Ben-Veniste, Richard, 1943-
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Boungawa - CC BY-SA 4.0
Williams, Richard, 1933-....
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Nadar - Public Domain
Galli-Marié, Celéstine, 1840-1905
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Angiviller, Charles Claude de La Billarderie, comte d', 1730-1809
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Office of Behavioral and Social Sciences Research, OD/NIH - Public Domain
Riley, Matilda White, 1911-....
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Philpot, Glyn, 1884-1937
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McLean, Washington, 1816-1890
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Eames, Emma, 1865-1952
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Fett - CC BY 2.0
Snyder, Gary, 1930-....
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Gage Skidmore - CC BY-SA 3.0
Katz, Claudia
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Public Domain
Walsh, David I. (David Ignatius), 1872-1947