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unknown - Public Domain
United States Navy photograph - Public Domain
Thomas Hamilton Crawford after Joshua Reynolds - Public Domain
Horton Brothers - Public Domain
Alasdairroberts -
Syaffe93 - CC BY-SA 4.0
Genesis Communications Network - CC BY-SA 3.0
unknown photographer - Public Domain
Hpschaefer - CC BY-SA 3.0
he - CC BY-SA 3.0
The Nobel Foundation - Public Domain
original uploader -
Professor Bop - CC BY 2.0
Copyrighted to Underwood & Underwood in 1922. - Public Domain
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Langsdorff, G. H. von (Georg Heinrich), 1774-1852
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unknown - Public Domain
Onderdonk, Benjamin T. (Benjamin Tredwell), 1791-1861
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Shadegg, John, 1949-
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United States Navy photograph - Public Domain
Conolly, Richard L. (Richard Lansing), 1892-1962
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Le Maire, Jacques, 1585-1616
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Dangar, H. (Henry), 1796-1861
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Macallum, A. B. (Archibald Byron), 1859-1934
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Morazán, Francisco (1792-1842).
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Langer, William, 1886-1959
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Thomas Hamilton Crawford after Joshua Reynolds - Public Domain
Blackstone, William, 1723-1780
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Horton Brothers - Public Domain
Faunce, William Herbert Perry, 1859-1930
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Alasdairroberts -
Crombie, David, 1936-
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Syaffe93 - CC BY-SA 4.0
Holzman, Malcolm, 1940-...
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Genesis Communications Network - CC BY-SA 3.0
Lewis, Jason
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unknown photographer - Public Domain
Church, Frederick, 1889-
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Ladd, Anna Coleman, 1878-1939
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Hpschaefer - CC BY-SA 3.0
Ackermann, Franz, 1963-....
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he - CC BY-SA 3.0
Abramson, Larry, 1954-
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unknown - Public Domain
Hanson, Einar, 1899-1927
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The Nobel Foundation - Public Domain
Norrish, Ronald George Wreyford, 1897-1978
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original uploader -
Dill, Clarence C. (Clarence Cleveland), 1884-1978
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Mature, Victor
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Professor Bop - CC BY 2.0
Wilson, Cassandra, 1955-....
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Cannon, Kevin
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unknown photographer - Public Domain
Doty, Douglas Zabriskie, 1874-1935
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Sun, Liren, 1900-1990
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Gagen-Torn, N. I. (Nina Ivanovna)
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Copyrighted to Underwood & Underwood in 1922. - Public Domain
Briggs, Clare A., 1875-1930
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Smith, Warren, 1934-
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Schuyler, Eugène, 1840-1890