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unknown - Public Domain
film screenshot - Public Domain
Jrkruk - CC BY-SA 3.0
Public Domain
National Science Foundation - Public Domain
U.S. Embassy in Argentina - CC BY 2.0
Canada Jack - CC BY-SA 3.0
John Moodie Heddle & T Mainland - Public Domain
Brachialromantiker - CC BY-SA 3.0
US Government Printing Office - Public Domain
Not stated - Public Domain
Furahiya - CC BY-SA 3.0
Joxerra - CC BY-SA 3.0
Original uploader was Milneg - Public Domain
henryk Hirszel (1809-1877) - Public Domain
Mike Kirby -
CBS Television - Public Domain
Bassano - Public Domain
Photographer(s) unknown / not credited -
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unknown - Public Domain
Wegner, Armin T., 1886-1978
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film screenshot - Public Domain
Kerrigan, J. M. (Joseph M.), 1884-1964
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Jrkruk - CC BY-SA 3.0
Paleczny, Piotr
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Public Domain
Chaĭkovskiĭ, Modest, 1850-1916
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National Science Foundation - Public Domain
National Medal of Science.
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U.S. Embassy in Argentina - CC BY 2.0
Proulx, Annie
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Titius, Johann Daniel, 1729-1796
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Canada Jack - CC BY-SA 3.0
Childs, Barney
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Brzezinski, Zbigniew, 1928-2017
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Mangano, Silvana, 1930-1989
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John Moodie Heddle & T Mainland - Public Domain
Laing, Malcolm, 1762-1818
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Thompson, John V. (John Vaughan), 1779-1847
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Konsag, Ferdinand, 1703-1759
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Brachialromantiker - CC BY-SA 3.0
Woermann, Karl, 1844-1933
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US Government Printing Office - Public Domain
Judd, Walter H., 1898-1994
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Not stated - Public Domain
Kerby, William J. (William Joseph), 1870-1936
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Furahiya - CC BY-SA 3.0
Pierson, Tom, 1948-
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Joxerra - CC BY-SA 3.0
Sastre, Alfonso, 1926-....
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Original uploader was Milneg - Public Domain
Senior, Nassau William, 1790-1864
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henryk Hirszel (1809-1877) - Public Domain
Birkowski, Fabian, 1566-1636
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Mike Kirby -
Blenkinsop, John, 1783?-1831
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CBS Television - Public Domain
Slate, Jeremy
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Alma-Tadema, Laura Theresa, Lady, 1852-1909
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Bassano - Public Domain
Pound, Dudley, Sir, 1877-1943
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Agosti, Orlando Ramón
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unknown - Public Domain
Macció, Rómulo, 1931-
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Photographer(s) unknown / not credited -
Oosterzee, Cornélie van 1863-1943
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unknown - Public Domain
Alfonso III d'Este, Duke of Modena, 1591-1644
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Reynolds, Joshua, Sir, 1723-1792
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Herring, Edmund, Sir, 1892-