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unknown - Public Domain
Georg Brokesch - Public Domain
original uploader - Public Domain
Stephencdickson - CC BY-SA 4.0
Ellen Abrams - CC BY-SA 4.0
MACBA Museu d'Art Contemporani de Barcelona - CC BY-SA 2.0
Bain - Public Domain
William F. Connor - Public Domain
GFHund - CC BY 3.0
Beth Hommel - CC BY 3.0
PatrickAmentcommons - CC BY-SA 4.0
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Löbe, Paul, 1875-1967
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Ramanujan Aiyangar, Srinivasa, 1887-1920
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unknown - Public Domain
Bertrand, Joseph, 1822-1900
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Croone, William, 1633-1684
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Patric, Jason
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Cadwalader, John L. (John Lambert), 1836-1914
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Georg Brokesch - Public Domain
Windscheid, Bernhard, 1817-1892
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Eyck, Aldo van 1918-1999
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original uploader - Public Domain
Rothschild, Nathaniel Mayer, Baron, 1840-1915
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Stephencdickson - CC BY-SA 4.0
Addington, Anthony, 1713-1790
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Ellen Abrams - CC BY-SA 4.0
Baker, Kevin, 1958-....
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O'Brien, William, 1852-1928
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MACBA Museu d'Art Contemporani de Barcelona - CC BY-SA 2.0
Colomer, Jordi, 1962-....
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Skellings, Edmund
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Saraste, Jukka-Pekka
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Bain - Public Domain
Morgan, Junius Spencer, 1892-1960
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unknown - Public Domain
Lundgren, Egron, 1815-1875
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Ruskin, John, 1819-1900
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William F. Connor - Public Domain
O'Neill, James, 1847-1920
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Roujon, Henry, 1853-1914
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Rowson, Mrs., 1762-1824
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Wordsworth, Dorothy, 1771-1855
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Wilde, Constance, 1858-1898
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Bennett, Arnold, 1867-1931
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Paryla, Karl, 1905-
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Guérin, Paulin-Jean-Baptiste (1783-1855).
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Crabbe, Buster, 1908-1983
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GFHund - CC BY 3.0
Wheeler, John Archibald, 1911-2008
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Beth Hommel - CC BY 3.0
Palmer, Amanda, 1976-
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PatrickAmentcommons - CC BY-SA 4.0
Croft, Peter, 1958-