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unknown - Public Domain
© Richards family archive - CC BY-SA 4.0
Dirsmith1 - CC BY-SA 4.0
Fred.arnal - CC BY-SA 4.0
Susan Macdowell Eakins - Public Domain
Tessa Posthuma de Boer - Public Domain
Che - CC BY-SA 2.5
Ardagh, Henry Hatton, 1853-1936 - Public Domain
James Arthur Roberts - Public Domain
unknown - CC BY 4.0
Denverjeffrey - CC BY-SA 3.0
Public Domain
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Phillips, Dorothy, 1889-1980
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unknown - Public Domain
Bandstra, Bert, 1922-1995
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© Richards family archive - CC BY-SA 4.0
Richards, I.A. (Ivor Armstrong), 1893-1979
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Dirsmith1 - CC BY-SA 4.0
Morandi, Riccardo, 1902-1989
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Fred.arnal - CC BY-SA 4.0
Martínez Celaya, Enrique, 1964-
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Sparrman, Anders, 1748-1820
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Beltrami, Giacomo Costantino, 1779-1855
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Bell, Jacobus, -1859
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Kislingbury, Frederick Foster, 1847-1884
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unknown - Public Domain
Hascall, Milo Smith, 1829-1904
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Drury, E. C. (Ernest Charles), 1878-1968
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Susan Macdowell Eakins - Public Domain
Cadwalader, Thomas, 1795-1873
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Tessa Posthuma de Boer - Public Domain
Jansen, Rudolf, 1940-
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Loosjes Pz., A. (Adriaan Loosjes Pieterszoon), 1761-1818
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Beaufort, Margaret, Countess of Richmond and Derby, 1443-1509
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Che - CC BY-SA 2.5
Burrows, Saffron
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Marsh, John, 1799-1856
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Finlay, Kirkman, 1773-1842
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unknown - Public Domain
Kaibara, Ekiken, 1630-1714
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Belcher, Jonathan, 1710-1776
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Ardagh, Henry Hatton, 1853-1936 - Public Domain
Gowan, James Robert, Sir, 1815-1909
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James Arthur Roberts - Public Domain
Collier, John A. (John Allen), 1787-1873
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unknown - CC BY 4.0
Langley, J. N. (John Newport), 1852-1925
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Denverjeffrey - CC BY-SA 3.0
Little, Floyd, 1942-
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Hunter, Duncan, 1948-
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Bond, Carroll T. (Carroll Taney), 1873-1943
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Public Domain
Mercier, Auguste, 1833-1921
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Widener, Joseph E. (Joseph Early), 1872-1943
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Spreckelsen, Johan-Otto von
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Wattenbach, Wilhelm, 1819-1897