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National Institute of Standards and Technology - Public Domain
GFHund - CC BY 3.0
Public Domain
P. Bodart - Public Domain
Asheresque - CC BY-SA 4.0
Chairman of the Joint Chiefs of Staff - Public Domain
Al Chang - Public Domain
unknown - Public Domain
Columbia Records - Public Domain
Photographer: Maurice Seymour, Chicago. - Public Domain
Harris & Ewing, photographer - Public Domain
user at project -
Georges Biard - CC BY-SA 3.0
after Marie-Alexandre Alophe - Public Domain
Alexander Sutherland (book author) - Public Domain
Brentoncomposer - CC BY-SA 4.0
Photographer not credited - Public Domain
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National Institute of Standards and Technology - Public Domain
Burgess, G. K. (George Kimball), 1874-1932
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GFHund - CC BY 3.0
Minkowski, Rudolf 1895-1976
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Clément, Edmond, 1867-1928
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Whetstone, William, Sir, -1711
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Public Domain
Beauchamp, Jereboam O., 1802-1826
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Fleischman, Paul
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P. Bodart - Public Domain
Petronius Arbiter
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Asheresque - CC BY-SA 4.0
Asher, Levi
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Thornton, Anna Maria Brodeau, 1775?-1865
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Ackermann, Rudolph, 1764-1834
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Chairman of the Joint Chiefs of Staff - Public Domain
Letterman, David
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Al Chang - Public Domain
Millett, Lewis L. (Lewis Lee), 1920-2009
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Hollister, John B. (John Baker), 1890-1978
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Public Domain
Mercer, Hugh W. (Hugh Weedon), 1808-1877
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unknown - Public Domain
Lei, Zhen, 1897-1979
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Columbia Records - Public Domain
Smith, Carl, 1927-2010
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Fonseca, Deodoro da, 1827-1892
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Litton, James H.
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Garant, Serge, 1929-1986
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Astor, Waldorf Astor, Viscount, 1879-1952
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Photographer: Maurice Seymour, Chicago. - Public Domain
Jurgens, Dick, 1910-1995
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Chesterton, Cecil, 1879-1918
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Harris & Ewing, photographer - Public Domain
Chadbourne, Thomas L. (Thomas Lincoln), 1871-1938
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user at project -
Lohia, Rammanohar
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Georges Biard - CC BY-SA 3.0
Sutherland, Donald, 1935-
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after Marie-Alexandre Alophe - Public Domain
Adam, Louis, 1758-1848
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Alexander Sutherland (book author) - Public Domain
Smith, James, 1820-1910
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Broderick, David C. (David Colbreth), 1820-1859
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Brentoncomposer - CC BY-SA 4.0
Broadstock, Brenton, 1952-
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Photographer not credited - Public Domain
Stöcker, Helene, 1869-1943