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Cccrrriiissst - CC BY-SA 4.0
unknown - Public Domain
I, Klugschnacker - CC BY-SA 3.0
Frank Saptel - CC BY-SA 2.0
Public Domain
Tejanoviejo - CC BY-SA 3.0
not stated - Public Domain
Flickr user ''rabbleradio'' - CC BY 2.0
Alan Light - CC BY 2.0
Lairich Rig -
Sumori - CC BY-SA 3.0
Markus Pössel Mapos - CC BY-SA 3.0
U.S. Department of Energy - Public Domain
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Cccrrriiissst - CC BY-SA 4.0
Moyse, Marcel, 1889-1984
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unknown - Public Domain
Davis, Jessie Bartlett, 1861-1905
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I, Klugschnacker - CC BY-SA 3.0
ʻAli ibn Riḍwān, -approximately 1068
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Frank Saptel - CC BY-SA 2.0
Nolan, Faith
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Coggins, Jack.
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unknown - Public Domain
Harris, T. M. (Thomas Mealey), 1817-1906
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McKee, William F. (William Fulton), 1906-1987
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Wynfield, David Wilkie, 1837-1887
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Public Domain
Jackson, William Henry, 1843-1942
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Kicking Bird, -1875
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Arriaga, Manuel de 1840-1917
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Hudson, James, Sir, 1810-1885
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Drake, Heinrich
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Tejanoviejo - CC BY-SA 3.0
YBarbo, Antonio Gil, 1729-1809
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not stated - Public Domain
Graham, Harry, 1874-1936
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Yukawa, Hideki, 1907-1981
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Bunge, N. Kh. (Nikolaĭ Khristianovich), 1823-1895
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unknown - Public Domain
Avramenko, Vasylʹ
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Beurnonville, Pierre Riel, marquis de, 1752-1821
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Martin, Jas. S. (James Stewart), 1826-1907
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Flickr user ''rabbleradio'' - CC BY 2.0
Morgentaler, Henry
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Alan Light - CC BY 2.0
Burke, Delta
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Gott, John, 1830-1906
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Jean-Baptiste Annibal Aubert du Bayet
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Lairich Rig -
Weir, Tom, 1914-2006
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Sumori - CC BY-SA 3.0
K-Doe, Ernie
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Markus Pössel Mapos - CC BY-SA 3.0
Albert, David Z.
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U.S. Department of Energy - Public Domain
Smyth, Henry de Wolf 1898-1986
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Garrison, Fielding H. (Fielding Hudson), 1870-1935
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Woodruff, Hale, 1900-1980