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New Zealand Labour Party - CC BY 3.0
*:File:Zuzana_Halupova_3.jpg -
Germain Green Glidden, 1952 - Public Domain
X-PRIZE - CC BY 2.0
Public Domain
unknown - Public Domain
Desconocido, c. 1920 - Public Domain
Ethan231h - CC BY-SA 4.0
Russian Presidential Press Service; crop by Lockal - CC BY 4.0
Photo d'identité sans auteur, '''1928''' -
Marie Anne Bourlier, after John Downman - Public Domain
Cover credit: O. J. Jordan - Public Domain
agnostizi - Public Domain
Marlene Picard - CC BY-SA 3.0
Southworth & Hawes - Public Domain
Thomas Eller -
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New Zealand Labour Party - CC BY 3.0
Gallagher, Martin, 1952-
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*:File:Zuzana_Halupova_3.jpg -
Chalupová, Zuzana, 1925-
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Tsatsos, Kōnstantinos 1899-1987
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Germain Green Glidden, 1952 - Public Domain
Pace, Frank, Jr., 1912-1988
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Stommel, Henry M., 1920-1992
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Wotherspoon, William W. (William Wallace), 1850-1921
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Martineau, John E. (John Ellis), 1873-1937
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X-PRIZE - CC BY 2.0
Brooks, Avery
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Public Domain
Moore, Dick, 1925-
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unknown - Public Domain
Bradford, William, 1590-1657
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unknown - Public Domain
Campbell, James V. (James Valentine), 1823-1890
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Drake, Betsy, 1923-
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Desconocido, c. 1920 - Public Domain
Sabogal, José 1888-1956
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Ethan231h - CC BY-SA 4.0
Siegel, Larry, 1925-
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Larreta, Enrique, 1875-1961
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Goethe, Catharina Elisabeth, 1731-1808
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Russian Presidential Press Service; crop by Lockal - CC BY 4.0
Granin, Daniil
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Gromaire, Marcel, 1892-1971
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Photo d'identité sans auteur, '''1928''' -
Benjamin, Walter, 1892-1940
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unknown - Public Domain
Palmer, Walter Launt, 1854-1932
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Meigs, Josiah, 1757-1822
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Marie Anne Bourlier, after John Downman - Public Domain
Middleton, Charles, 1726-1813
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Cover credit: O. J. Jordan - Public Domain
Johnson, Hugh S. (Hugh Samuel), 1882-1942
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Szymanowska, Maria Agata Wołowska, 1789-1831
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Visscher, Claes Jansz., 1586 or 1587-1652
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agnostizi - Public Domain
Garzón Valdés, Ernesto
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Marlene Picard - CC BY-SA 3.0
Buchanan, Nancy, 1946-
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Southworth & Hawes - Public Domain
Hawes, Josiah Johnson, 1808-1901
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Marbury, Elisabeth, 1856-1933
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Thomas Eller -
Eller, Thomas, 1964-