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unknown - Public Domain
Tony Sarg - Public Domain
Per Krafft the Younger - Public Domain
Ben Skála - CC BY-SA 3.0
Photo by Rio V. De Sieux - Public Domain
Mabel Rowland, Inc. - Public Domain
Associated Newspapers /Rex Features - Public Domain
William Ewart Gladstone - Public Domain
Carlo Rondinelli - CC BY 2.0
David Shankbone - CC BY 3.0
Cecilia Vicuna - CC BY 4.0
Photo by Vesperholly - CC BY-SA 2.5
U.S. Air Force - Public Domain
Jimormond - CC BY-SA 4.0
D. Waldt - Public Domain
"Saint Paul Globe" (Saint Paul, MN). - Public Domain
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unknown - Public Domain
Tighe, Mary, 1772-1810
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Tony Sarg - Public Domain
Cobb, Irvin S. (Irvin Shrewsbury), 1876-1944
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Bushman, Francis X., 1883-1966
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Per Krafft the Younger - Public Domain
Wingård, Carl Fredrik af, 1781-1851
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Ben Skála - CC BY-SA 3.0
Placzek, G. (George), 1905-1955
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Photo by Rio V. De Sieux - Public Domain
Yuan, Shikai, 1859-1916
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Perizonius, Jacobus, 1651-1715
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La Bourdonnais, Bertrand-François Mahé, comte de, 1699-1753
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Mabel Rowland, Inc. - Public Domain
Santley, Joseph, 1889-1971
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Boghossian, Skunder, 1937-2003
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Associated Newspapers /Rex Features - Public Domain
Demara, Ferdinand Waldo, 1921-1982
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William Ewart Gladstone - Public Domain
Hallam, Arthur Henry, 1811-1833
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Blount, Willie, 1768-1835
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Carey, William, 1759-1839
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Vanier, Georges P. (Georges Philias), 1888-1967
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unknown - Public Domain
Long, Marguerite, 1874-1966
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Carlo Rondinelli - CC BY 2.0
Davis, Walter, 1932-1990
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McLane, Robert M. (Robert Milligan), 1815-1898
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Diziani, Gaspare, 1689-1767
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Stromeyer, Friedrich, 1776-1835
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David Shankbone - CC BY 3.0
Quinn, Aidan
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Haviland, John, 1792-1852
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unknown - Public Domain
Brown, Elmer Ellsworth, 1861-1934
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Cecilia Vicuna - CC BY 4.0
Vicuña, Cecilia, 1948-
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Photo by Vesperholly - CC BY-SA 2.5
Kwan, Michelle, 1980-
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U.S. Air Force - Public Domain
Cabell, Charles P. (Charles Pearre), 1903-1971
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Jimormond - CC BY-SA 4.0
Association for Computing Machinery (ACM)
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D. Waldt - Public Domain
Bevel, James Luther, 1936-2008
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unknown - Public Domain
Bischoff, Th. Ludw. Wilh. (Theodor Ludwig Wilhelm), 1807-1882
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"Saint Paul Globe" (Saint Paul, MN). - Public Domain
Hall, Darwin S. (Darwin Scott), 1844-1919