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Public Domain
unknown - Public Domain
Elliott & Fry -
Kyrichips - CC BY-SA 3.0
National Library of Denmark - Public Domain
uncredited - Public Domain
US Government Printing Office - Public Domain
Bitman - CC BY-SA 3.0
Ambroise Tardieu - Public Domain
Original uploader was Cantikfotos - CC BY-SA 2.5
Judd Studio - Public Domain
NASA - Public Domain
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Leslie, George Dunlop, 1835-1921
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Public Domain
Lightfoot, Joseph Barber, 1828-1889
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Rowan, John, 1773-1843
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Penn, Hannah Callowhill, 1671-1726
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unknown - Public Domain
Cesarini, Alessandro, Cardinal 1517
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unknown - Public Domain
Stirling, A. M. W. (Anna Maria Wilhelmina), 1865-1965
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Elliott & Fry -
Blaikie, William Garden, 1820-1899
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Kyrichips - CC BY-SA 3.0
Doxiadēs, Apostolos K., 1953-
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National Library of Denmark - Public Domain
Rosanoff, A. J. (Aaron Joshua), 1878-
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unknown - Public Domain
Billot, Jean-Baptiste, 1828-1907
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Symonds, John Addington, 1807-1871
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uncredited - Public Domain
Rothafel, Samuel Lionel, 1881-1936
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unknown - Public Domain
Smith, Lot
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US Government Printing Office - Public Domain
Leboutillier, John
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Bitman - CC BY-SA 3.0
Olah, George A. (George Andrew), 1927-
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Alexander, Sadie Tanner Mossell, 1898-1989
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Ambroise Tardieu - Public Domain
Saussure, Horace-Bénédict de 1740-1799
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Sieveking, Edward H. (Edward Henry), 1816-1904
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Repetto, Nicolás 1871-1965
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unknown - Public Domain
Theiler, Max, 1899-1972
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Original uploader was Cantikfotos - CC BY-SA 2.5
Griffiths, Philip Jones.
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Salieri, Antonio, 1750-1825
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Lee, Sophia, 1750-1824
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Judd Studio - Public Domain
Nat, Yves
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Adelung, Johann Christoph, 1732-1806
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Orvilliers, M. le comte d' (Louis Guillouet), 1708-1792
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Monsell, William, 1812-1894
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unknown - Public Domain
Hensen, Victor, 1835-1924
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Slingeland, Pieter Cornelisz van 1640-1691
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NASA - Public Domain
Gemini VI-A (Spacecraft)