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Lewis Clinton Strang - Public Domain
GeoPaul7 - CC BY-SA 4.0
Nv8200p - CC BY-SA 3.0
Samuel Lawrence - Public Domain
Zane Grey Pictures - Public Domain
Hill123 - CC BY-SA 3.0
Elena Klusemann-Hochman - CC BY-SA 3.0
No photographer named in original source. - Public Domain
Miller of Washington - Public Domain
Project Gutenberg - Public Domain
Deedeebee - CC BY 3.0
William Simonton - Public Domain
Cybjorg - CC BY-SA 3.0
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Nevanlinna, Rolf, 1895-1980
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Lewis Clinton Strang - Public Domain
Shannon, Effie, 1867-1954
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Adler, Luther, 1903-1984
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Howard, Henry, 1826-1905
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GeoPaul7 - CC BY-SA 4.0
Sutton, George Miksch, 1898-1982
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Fry, Elizabeth Gurney, 1780-1845
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Bullock, Matthew W. (Matthew Washington), 1882-1972
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Nv8200p - CC BY-SA 3.0
Romano, Carlin
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Ochsenheimer, Ferdinand, 1767-1822
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Hubbard, Kin, 1868-1930
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Samuel Lawrence - Public Domain
Palgrave, Francis Turner, 1824-1897
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Zane Grey Pictures - Public Domain
McKim, Robert, 1886-1927
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Hill123 - CC BY-SA 3.0
James, C. L. R. (Cyril Lionel Robert), 1901-1989
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Snider, Clifton
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Magallanes, Nicholas
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Elena Klusemann-Hochman - CC BY-SA 3.0
Klusemann, Georg, 1942-
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No photographer named in original source. - Public Domain
Erskine, Payne, 1854-1924
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Berkeley, William, Sir, 1605-1677
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Miller of Washington - Public Domain
Herlong, Albert Sydney, 1909-1995
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Rethel, Alfred, 1816-1859
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Traetta, Tommaso, 1727-1779
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Project Gutenberg - Public Domain
Sandhurst, William Mansfield, Viscount, 1855-1921
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Deedeebee - CC BY 3.0
Burton, Marion Le Roy, 1874-1925
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Abel-Smith, Brian, 1926-1996
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Butler, Dan, 1954-
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Piers, John, 1522 or 1523-1594
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William Simonton - Public Domain
Simonton, A. G. (Ashbel Green), 1833-1867
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Cybjorg - CC BY-SA 3.0
National Air and Space Museum
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Todd, Eli, 1769-1833
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Heysen, Nora, 1911-