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Archive.org - Public Domain
Adolf Dauthage - Public Domain
artist unknown - Public Domain
oscalito - CC BY-SA 2.0
Alfred Aho - Public Domain
Luizpuodzius - CC BY-SA 4.0
Contemporary photograph - Public Domain
Nv8200p - CC BY-SA 4.0
original uploader - Public Domain
Dillonsherlock - CC BY-SA 4.0
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unknown - Public Domain
Kirkpatrick, William, 1769-1832
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Burr, Raymond, 1917-1993
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unknown - Public Domain
Abraham, William, 1842-1922
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Weizenbaum, Joseph.
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Richards, Alma, 1890-1963
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https://www.flickr.com/photos/unfccc/ Unclimaitechange - CC BY-SA 2.0
Albert II, Prince of Monaco, 1958-
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Archive.org - Public Domain
Matthews, Jessie
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Taché, Eugène-Étienne 1836-1912
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Newberry, Truman Handy, 1864-1945
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Adolf Dauthage - Public Domain
Wolf, Ferdinand, 1796-1866
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artist unknown - Public Domain
Smith, Heman C. (Heman Conoman), 1850-1919
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oscalito - CC BY-SA 2.0
Stoltz, Eric, 1961-...
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Sen, Amartya, 1933-....
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Alfred Aho - Public Domain
Aho, Alfred V.
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Lucas, E.V. (Edward Verrall), 1868-1938
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Luizpuodzius - CC BY-SA 4.0
Clark, Lygia, 1920-
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Cathcart, William Schaw Cathcart, Earl, 1755-1843
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unknown - Public Domain
Schley, William, 1786-1858
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Bauzà, Felip, 1764-1834
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Contarini, Nicolò, 1553-1631
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Contemporary photograph - Public Domain
Farnam, Henry, 1803-1883
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Nv8200p - CC BY-SA 4.0
Hutton, Paul Andrew, 1949-
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Culberson, Charles A. (Charles Allen), 1855-1925
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Skylar, Sunny, 1913-2009
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original uploader - Public Domain
Faruffini, Federico, 1831-1869
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Dillonsherlock - CC BY-SA 4.0
Gaines, Steve
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Trarieux, L. (Ludovic), 1840-1904
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Sucher, Rosa
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Blair, Emily Newell, 1877-
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Grimes, Frances