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US Government Printing Office - Public Domain
published by chatto and windus 1893 - Public Domain
enormospenner - CC BY 2.0
unknown - Public Domain
Jummai - CC BY-SA 3.0
Georges Biard - CC BY-SA 3.0
Nv8200p - CC BY-SA 3.0
unknown -
Martin Maack - Public Domain
Ernst Hader (Maler) - Public Domain
BiblioArchives / LibraryArchives - CC BY 2.0
Princeton University, courtesy Prof. Schwarzchild - CC BY-SA 3.0
George Grantham Bain Collection (Library of Congress) - Public Domain
Eric Maisel - CC BY-SA 3.0
gdcgraphics - CC BY-SA 2.0
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Degouve de Nuncques, William, 1867-1935
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US Government Printing Office - Public Domain
McEwen, Robert C.
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published by chatto and windus 1893 - Public Domain
Hachette, Louis, 1800-1864
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Auer, Leopold, 1845-1930
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Swetchine, Madame (Anne-Sophie), 1782-1857
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enormospenner - CC BY 2.0
Walker, Murray, 1923-
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unknown - Public Domain
Fuldheim, Dorothy
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Jummai - CC BY-SA 3.0
Alexander, Neville
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Bourdois de la Motte, Edme Joachim, 1754-1835?
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Gwynne, H. A. (Howell Arthur), 1865-1950
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Georges Biard - CC BY-SA 3.0
Castaldi, Jean-Pierre, 1944-
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Nesmith, James Willis, 1820-1885
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Krebsbach, Eduard
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Cunningham, Allan, 1784-1842
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Griffin, Lepel Henry, Sir, 1840-1908
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Nv8200p - CC BY-SA 3.0
Wolitzer, Meg
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unknown -
Launis, Armas, 1884-1959
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Martin Maack - Public Domain
Grosse, Julius, 1828-1902
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Ernst Hader (Maler) - Public Domain
Döhler, Théodore, 1814-1856
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Wildman, John, Sir, 1621?-1693
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BiblioArchives / LibraryArchives - CC BY 2.0
Pickersgill, J. W., 1905-
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Princeton University, courtesy Prof. Schwarzchild - CC BY-SA 3.0
Schwarzschild, Martin
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George Grantham Bain Collection (Library of Congress) - Public Domain
Barton, Ralph, 1891-1931
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Hayman, Francis, 1708-1776
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Rogers, Buddy, 1904-1999
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Eric Maisel - CC BY-SA 3.0
Maisel, Eric, 1947-
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Kinnaird, Arthur, 1814-1887
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Kurzweil, Allen.
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gdcgraphics - CC BY-SA 2.0
Crewson, Wendy
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Seidler, Harry, 1923-2006