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unknown - Public Domain
R. McCants Andrews (Robert McCants) - Public Domain
Edwardx - Public Domain
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The Library Publishing Co. - Public Domain
PatrickAmentcommons - CC BY-SA 4.0
Kuzma Sergeevich Petrov-Vodkin - Public Domain
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Herndon, Marcia
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Dempsey, John, 1915-
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Firth, Charles
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Jfrancis51 - CC BY-SA 3.0
Francis, W. Nelson (Winthrop Nelson), 1910-2002
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Serov, Valentin Aleksandrovich, 1865-1911
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Webpadre - CC BY-SA 3.0
Kurelek, William, 1927-1977
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United States Senate Historical Society - Public Domain
Gurney, Chan, 1896-1985
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Young, Sean
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Haddon, Dayle 1949-....
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Furchgott, Robert F., 1916-2009
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Newton, C. T. (Charles Thomas), 1816-1894
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Agostinho Neto, António, 1922-1979
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http://evelyncameron.com - Public Domain
Cameron, Evelyn, 1868-1928
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unknown - Public Domain
Heinzen, Karl, 1809-1880
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unknown - Public Domain
Courtland, Jerome, 1926-
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Taylor, T. E.
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R. McCants Andrews (Robert McCants) - Public Domain
Merrick, John, 1859-1919
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Edwardx - Public Domain
Mosheim, Greta
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Paryla, Karl, 1905-
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Rogers, Leonard, 1868-1962
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Ash, Mary Kay
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Morera, Enric, 1865-1942
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Gage Skidmore - CC BY-SA 3.0
Benson, Doug
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John, James
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The Library Publishing Co. - Public Domain
Kennedy, Charles Rann, 1871-1950
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PatrickAmentcommons - CC BY-SA 4.0
Croft, Peter, 1958-
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Rob Roy, 1671-1734
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Wagner, Karl Edward
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Kuzma Sergeevich Petrov-Vodkin - Public Domain
Petrov-Vodkin, Kuzʹma Sergeevich, 1878-1939
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Gramatges, Harold, 1918-2008