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Fotograf: Vogt, Marcel - CC BY-SA 4.0
Smithsonian Institution -
Gemma Planell - CC BY-SA 4.0
Leon Levson (1883-1968) - CC BY-SA 4.0
unknown - Public Domain
Mathew Brady - Public Domain
Michaelbetancourt - CC BY-SA 3.0
Isidor Harkányi (1852–1932) - Public Domain
anonymous -
Pigsonthewing - CC BY-SA 4.0
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Fotograf: Vogt, Marcel - CC BY-SA 4.0
Bill, Max, 1908-1994
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Gardoqui y Arriquibar, Diego, 1735-1798
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Segrè, Emilio
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Bakfark, Bálint, 1507-1576
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Leavitt, M. B. (Michael B.), 1843-1935
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Rahall, Nick J. (Nick Joe), II, 1949-
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Smithsonian Institution -
Carlsen, Emil, 1853-1932
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Gemma Planell - CC BY-SA 4.0
Mullican, Matt, 1951-
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Leon Levson (1883-1968) - CC BY-SA 4.0
Eybers, Elisabeth, 1915-2007
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Secunda, Sholom, 1894-1974
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unknown - Public Domain
Stewart, Nellie, 1858-1931
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Mathew Brady - Public Domain
Ruggles, Daniel, 1810-1897
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Michaelbetancourt - CC BY-SA 3.0
Betancourt, Michael
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Dryden, John, 1631-1700
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Delaval, John Hussey Delaval, Baron, 1728-1808
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Pinheiro, Columbano Bordalo, 1857-1929
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Beamont, William, 1797?-1889
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Horsfield, Thomas, 1773-1859
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Isidor Harkányi (1852–1932) - Public Domain
Lammasch, Heinrich, 1853-1920
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Cassini, Giovanni Domenico, 1625-1712
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Cornélissen, Christiaan (1864-1943).
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Barnett, Jackson, 1856-1934
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unknown - Public Domain
Charles, Thomas, 1755-1814
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Castilho, António Feliciano de, 1800-1875
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Tarascon, Paul 1882-1977
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Madero, Francisco I., 1873-1913
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unknown - Public Domain
Du Pont, Eleuthère Irénée, 1771-1834
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D'Arcy, Roy, 1894-1969
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anonymous -
Skraup, Zdenko Hans
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Pigsonthewing - CC BY-SA 4.0
Liversidge, Archibald, 1847-