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unknown -
Contemporary engraving - Public Domain
L. R. Hamersly Co. - Public Domain
unknown - Public Domain
LandiaEgal - CC BY-SA 3.0
Werner & Son of Dublin - Public Domain
Harris & Ewing - Public Domain
Ajzh2074 - CC BY-SA 3.0
:en:Colgate University -
George Grantham Bain Collection (Library of Congress) - Public Domain
Public Domain
Wlliam Murray Stone - Public Domain
Chiloa - CC BY-SA 3.0
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unknown -
Occhialini, Giuseppe, 1907-1993.
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Contemporary engraving - Public Domain
Pollard, John Garland, 1871-1937
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Lamarck, Jean-Baptiste Pierre Antoine de Monet de 1744-1829
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Morell, Theodor Gilbert, 1886-1948
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L. R. Hamersly Co. - Public Domain
Breck, Samuel, 1834-1918
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Tidhar, David, 1897-1970
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Shaw, Wini 1900?-....
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Desboutin, Marcellin, 1823-1902
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unknown - Public Domain
Beaupré, Joseph-Édouard 1881-1904
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McDonald, Marshall, 1835-1895
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LandiaEgal - CC BY-SA 3.0
Guédiguian, Robert, 1953-
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Wordsworth, William, 1770-1850
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Feuerbach, Paul Johann Anselm, Ritter von, 1775-1833
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Werner & Son of Dublin - Public Domain
King, Cecil Harmsworth
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Longfellow, Samuel, 1819-1892
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Heller, Stephen, 1813-1888
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Cormenin, Louis-Marie de Lahaye, vicomte de, 1788-1868
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Laurie, Piper, 1932-....
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Brooke, Van Dyke, -1921
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Harris & Ewing - Public Domain
Clark, Georgia Neese, 1900-1995
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Coles, Edward, 1786-1868
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Lawrence, D. H. (David Herbert), 1885-1930
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Ajzh2074 - CC BY-SA 3.0
Piquer, Andrés, 1711-1772
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:en:Colgate University -
Balakian, Peter, 1951-....
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Jansson, Eugène 1862-1915
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George Grantham Bain Collection (Library of Congress) - Public Domain
Birrell, Augustine, 1850-1933
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Kershner, Irvin
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Public Domain
Bertini, Francesca, 1892-1985
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Wlliam Murray Stone - Public Domain
Stone, William Murray, 1779-1838
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Chiloa - CC BY-SA 3.0
Trudeau, Pierre Elliott