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eternalconceptspr - CC BY 2.0
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unknown - Public Domain
T and R Annan, Glasgow - Public Domain
Onehandclapping - CC BY-SA 3.0
Cvalverd (original); Rodtico21 (crooped) - CC BY-SA 4.0
Allan warren - CC BY-SA 3.0
N. C. Wingo - Public Domain
US Government Printing Office - Public Domain
Jean-Jacques Boissard: Bibliotheca chalcographica - Public Domain
Copyright © The Nobel Foundation 1924 - Public Domain
Judith Sedwick -
Bonnie - CC BY-SA 2.0
Ralph Daily - CC BY 2.0
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eternalconceptspr - CC BY 2.0
Brown, Olivia, 1960-
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Scan from Doug C. - CC BY-SA 3.0
Hayford, John Fillmore., 1868-1925
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unknown - Public Domain
Landauer, Gustav, 1870-1919
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Desnoyers, Auguste, 1779-1857
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T and R Annan, Glasgow - Public Domain
Guthrie, James, Sir, 1859-1930
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Mikszáth, Kálmán, 1847-1910
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Onehandclapping - CC BY-SA 3.0
Rakosi, Carl, 1903-2004
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Cvalverd (original); Rodtico21 (crooped) - CC BY-SA 4.0
Carazo, Rodrigo, 1926-2009
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Beauclerk, James, 1709 or 1710-1787
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Garman, Samuel, 1843-1927
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Snyder, Daniel, 1965-
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Barrett, Craig R., 1939-
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Swan, James G., 1818-1900
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Allan warren - CC BY-SA 3.0
Sanders, George, 1906-1972
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Huntington, Henry Edwards, 1850-1927
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Glaisher, James, 1809-1903
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N. C. Wingo - Public Domain
Vardaman, James Kimble, 1861-1930
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Cooke, William W., -1876
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Pradier, James, 1790-1852
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Newman, Charles, 1938-2006
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US Government Printing Office - Public Domain
Dent, John Herman, 1908-1988
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Jean-Jacques Boissard: Bibliotheca chalcographica - Public Domain
Meurs, Johannes van 1579-1639
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Spalding, Henry Harmon, 1803-1874
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Van Wyck, Robert Anderson, 1849-1918
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Copyright © The Nobel Foundation 1924 - Public Domain
Siegbahn, Manne, 1886-1978
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Judith Sedwick -
West, Dorothy, 1907?-1998
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Bonnie - CC BY-SA 2.0
Carlin, George
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Ralph Daily - CC BY 2.0
Laredo, Jaime
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Ward, George B., 1867-1940
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Visconti, Luchino, 1906-1976