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unknown -
Jim Summaria - CC BY-SA 3.0
Mvkulkarni23 - CC BY-SA 3.0
B. Braquehais - Public Domain
Alick Crossley - CC BY-SA 3.0
SBSRecords - CC BY-SA 3.0
St. Olaf College - CC BY 3.0
Public Domain
unknown - Public Domain
NOAA - Public Domain
Open Knowledge Foundation - CC BY 2.0
Adolf Hölzel - Public Domain
South Dakota State Historical Society - Public Domain
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unknown -
Skyrms, Brian
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Jim Summaria - CC BY-SA 3.0
Moon, Keith, 1946-1978
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Mvkulkarni23 - CC BY-SA 3.0
Majumdar, Ronu
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B. Braquehais - Public Domain
Saint-Léon, Arthur, 1821-1870
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Holroyd, Charles, 1861-1917
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Sutton, Don, 1945-
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Seghers, Gerard, 1591-1651
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Breteuil, Louis-Auguste Le Tonnelier, baron de, 1730-1807
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Wilton, Thomas Egerton, Earl of, 1749-1814
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Alick Crossley - CC BY-SA 3.0
Loeb, Damian, 1970-
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SBSRecords - CC BY-SA 3.0
Malone, Michelle
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St. Olaf College - CC BY 3.0
Seebach, J. Arthur.
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Public Domain
Noskowski, Zygmunt, 1846-1909
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unknown - Public Domain
Flanders, Helen Hartness, 1890-1972
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Sassoon, Albert Abdullah David, 1818-1896
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Rentmeister, Thomas, 1964-....
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Wilson, Riley Joseph, 1871-1947
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NOAA - Public Domain
Schott, Charles A. (Charles Anthony), 1826-1901
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Rayleigh, John William Strutt, baron, 1842-1919
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Open Knowledge Foundation - CC BY 2.0
Ellis, John, 1946-....
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Badinter, Robert
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George, of Trebizond, 1396-1486
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Baldwin, Alec, 1958-....
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De la Motte, Marguerite, 1902-1950
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Adolf Hölzel - Public Domain
Hölzel, Adolf, 1853-1934
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Tamburini, Antonio, 1800-1876
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Macmillan, Alexander, 1818-1896
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South Dakota State Historical Society - Public Domain
Pennington, John L., 1821-1900
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Vitriarius, Johann Jakob, 1679-1745
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unknown - Public Domain
Huddleston, George, 1869-1960