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Teddyyy - CC BY-SA 3.0
Street & Smith New York - Public Domain
unknown - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Central News And Illustrations Bureau - Public Domain
US Government Printing Office - Public Domain
[n.d.] - Public Domain
Georg Brokesch - Public Domain
Public Domain
Kenneth Allen -
F.A. Harper - CC BY 3.0
domain - CC0 1.0
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Teddyyy - CC BY-SA 3.0
Vincent, Gene, 1935-1971
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Schopper, Herwig F.
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Street & Smith New York - Public Domain
Lee, Dixie, 1911-1952
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Alfvén, Hugo
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unknown - Public Domain
Clinch, Duncan Lamont, 1787-1849
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George Grantham Bain Collection (Library of Congress) - Public Domain
Ugarte, Manuel, 1878-1951
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Mathew Brady Levin Corot Handy - Public Domain
Reed, Thomas B. (Thomas Brackett), 1839-1902
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Solomon, Andrew, 1963-....
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unknown - Public Domain
Davenport, Herbert Joseph, 1861-1931
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unknown - Public Domain
Seashore, Carl E. (Carl Emil), 1866-1949
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Ching, William, -1989
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Central News And Illustrations Bureau - Public Domain
Beesley, Lawrence, 1877-1967
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Taylor, Meadows, 1808-1876
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US Government Printing Office - Public Domain
Treen, David C., 1928-2009
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Richard, Achille, 1794-1852
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Brent, Romney, 1902-1976
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[n.d.] - Public Domain
Thom, Cameron Erskine, 1825-1915
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Georg Brokesch - Public Domain
Klengel, Julius, 1859-1933
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Anville, Jean-Baptiste Bourguignon d', 1697-1782
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La Plante, Laura, 1904-1996
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Public Domain
Steck, Daniel Frederic, 1881-1950
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Kenneth Allen -
March, Sydney (British architect, 1876-1968, active in Canada)
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Mehmed II, Sultan of the Turks, 1432-1481
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Lambert, Aylmer Bourke, 1761-1842
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F.A. Harper - CC BY 3.0
Harper, F. A. (Floyd Arthur), 1905-1973
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domain - CC0 1.0
Lewis, Jerry Lee, 1935-2022
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Public Domain
Cabell, William H., 1772-1853
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unknown - Public Domain
Lucas, Frederic A. (Frederic Augustus), 1852-1929
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Moffatt, John, 1922-2012
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Beck, Theodric Romeyn, 1791-1855