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unknown - Public Domain
unknown russian pre-revolutionary Photograph - Public Domain
Harris & Ewing, photographer - Public Domain
Willem van de Poll - CC BY-SA 3.0
United States Navy photograph - Public Domain
Jörg Zägel - CC BY-SA 3.0
original uploader - Public Domain
Perry, William Stevens. - Public Domain
Eino81 - Public Domain
Author - Peter Pelham, sold by Edward Cooper, after Thomas Gibson -
Photographer unidentified - Public Domain
anonymous - Public Domain
Ralf Liebau, stimmte der Veröffentlichung unter GNU zu, cropped Beyond My Ken -
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unknown - Public Domain
Anderson, Victor E. (Victor Emmanuel), 1902-1962
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unknown - Public Domain
Robert, Lawrence Wood, 1889-1976
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Jenkins, Florence Foster, 1868-1944
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Rougemont, Louis de 1847-1921
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Grosvenor, Richard Grosvenor, Earl, 1731-1802
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Dick, Robert 1811-1866
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unknown russian pre-revolutionary Photograph - Public Domain
Ippolitov-Ivanov, Mikhail Mikhaĭlovich, 1859-1935
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Fowler, Luke, 1978-....
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Harris & Ewing, photographer - Public Domain
Ashbrook, F. G. (Frank Getz), 1892-1966
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Willem van de Poll - CC BY-SA 3.0
Lattre, Jean de, 1889-1952
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United States Navy photograph - Public Domain
Leary, Herbert F., 1885-1957
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Jörg Zägel - CC BY-SA 3.0
Neander, August, 1789-1850
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Butler, Thomas S. (Thomas Stalker), 1855-1928
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Forman, Justus Miles, 1875-1915
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original uploader - Public Domain
Matteucci, Carlo, 1811-1868
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Spallanzani, Lazzaro, 1729-1799
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Perry, William Stevens. - Public Domain
Bowen, Nathaniel, 1779-1839
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Lepic, Louis
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Chukhont︠s︡ev, Oleg, 1938-
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unknown - Public Domain
Tunnard, Christopher
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Ponson du Terrail, 1829-1871
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Eino81 - Public Domain
Falk, Miksa
Image from Wikimedia Commons
Author - Peter Pelham, sold by Edward Cooper, after Thomas Gibson -
Molesworth, Robert Molesworth, Viscount, 1656-1725
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unknown - Public Domain
Guthe, Karl Eugen, 1866-1915
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Photographer unidentified - Public Domain
Runcie, Constance Owen Faunt Le Roy, 1836-1911
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anonymous - Public Domain
Tiffeneau, Marc
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Lockhart, James A. (James Alexander), 1850-1905
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Reményi, Eduard 1828-1898
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Radványi, Géza (1907-1986).
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Ralf Liebau, stimmte der Veröffentlichung unter GNU zu, cropped Beyond My Ken -
Newton, Helmut, 1920-2004