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Cornelis Coning - Public Domain
Florida Supercon - CC BY 2.0
user at project - CC BY-SA 3.0
anonymous - Public Domain
US Congress - Public Domain
Ray Jones, Universal Photo. - Public Domain
State Library of New South Wales collection -
Isabella Lucy Bird - Public Domain
World Economic Forum - Remy Steinegger - CC BY-SA 2.0
Public Domain
David Shankbone - CC BY 3.0
Константин Шапиро - Public Domain
Mark Perrott, photographer - CC BY 3.0
Mathew Brady - Public Domain
unknown - Public Domain
Billmckern - Public Domain
Robert Garner Attractions, Denver, where the pair did a personal appearance and concert. - Public Domain
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Polt, Gerhard
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Frend, William, 1757-1841
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Cornelis Coning - Public Domain
Philips, Dirk, 1504-1568
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Florida Supercon - CC BY 2.0
Williamson, Fred
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Fields, James Thomas, 1817-1881
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user at project - CC BY-SA 3.0
Keyes, Alan L. (Alan Lee), 1950-
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Le Verrier, U.-J. (Urbain J.), 1811-1877
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Quartero, Nina, 1908-1985
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Maurer, Ludwig, 1789-1878
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Boëllmann, Léon, 1862-1897
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anonymous - Public Domain
Isaac, Bishop of Nineveh, active 7th century
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US Congress - Public Domain
Buckley, James Lane, 1923-....
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Ray Jones, Universal Photo. - Public Domain
House, Billy, 1890-1961
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State Library of New South Wales collection -
Street, Jessie M. G., Lady, 1889-1970
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Carter, James C. (James Coolidge), 1827-1905
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Farnsworth, Charles Stewart, 1862-1955
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Isabella Lucy Bird - Public Domain
Cassels, William Wharton
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Johnson, Charles Spurgeon, 1893-1956
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World Economic Forum - Remy Steinegger - CC BY-SA 2.0
Harper, Stephen, 1959-....
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Public Domain
Gause, Lucien Coatsworth, 1836-1880
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David Shankbone - CC BY 3.0
Rifka, Judy, 1945-
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Hackett, James Keteltas, 1869-1926
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Константин Шапиро - Public Domain
Pleve, Vi︠a︡cheslav Konstantinovich, 1846-1904
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Mark Perrott, photographer - CC BY 3.0
Qualters, Robert
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Mathew Brady - Public Domain
Babcock, Orville Elias, 1835-1884
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unknown - Public Domain
Sorge, Friedrich A. (Friedrich Adolf), 1828-1906
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Billmckern - Public Domain
Paul, Willard Stewart, 1894-1966
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unknown - Public Domain
Tomasi di Lampedusa, Giuseppe, 1896-1957
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Robert Garner Attractions, Denver, where the pair did a personal appearance and concert. - Public Domain
Wilson, Demond
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Serly, Tibor