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Esselte - Public Domain
Alan Watts Foundation - CC BY-SA 4.0
Todd Rosenberg -
https://archive.org/details/nybc207099 - Public Domain
No photographer named in original source. - Public Domain
Rohitsuratekar - CC BY-SA 4.0
Eriotac - CC BY-SA 3.0
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Giulio Aleni - Public Domain
Philips Records - Public Domain
CrutchDerm2014 - CC BY-SA 4.0
Bigsurfad - CC BY-SA 3.0
XCalPab - CC BY-SA 3.0
unknown - Public Domain
Martin Kraft - CC BY-SA 3.0
US gov - Public Domain
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Theal, George McCall, 1837-1919
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Esselte - Public Domain
Gasser, Herbert S. (Herbert Spencer), 1888-1963
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Maeztu, María de
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Alan Watts Foundation - CC BY-SA 4.0
Watts, Alan, 1915-1973
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Todd Rosenberg -
Conlon, James, 1950-....
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Walke, Henry, 1808-1896
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https://archive.org/details/nybc207099 - Public Domain
Hourwich, Isaac A. (Isaac Aaronovich), 1860-1924
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Brianza, Carlotta 1867-1933
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No photographer named in original source. - Public Domain
Erskine, Payne, 1854-1924
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Cavendish Bentinck, G. A. F. (George Augustus Frederick), 1821-1891
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Knudson, Alfred G. (Alfred George), 1922-
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Rohitsuratekar - CC BY-SA 4.0
Tata Institute of Fundamental Research. National Centre for Biological Sciences
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Wade, Jeptha H., 1811-1890
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Eriotac - CC BY-SA 3.0
Le Bolloc'h, Yvan, 1961-
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Carteret, Philip, -1796
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Hellens, Franz
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Gaspari, Gaetano, 1808-1881
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Giulio Aleni - Public Domain
Aleni, Giulio, 1582-1649
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Philips Records - Public Domain
Hebb, Bobby
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CrutchDerm2014 - CC BY-SA 4.0
Rillieux, Norbert, 1806-1894
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Bigsurfad - CC BY-SA 3.0
King, Alice Gore
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XCalPab - CC BY-SA 3.0
Hewitt, Godfrey M.
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unknown - Public Domain
Dodge, Mary Mapes, 1830-1905
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Martin Kraft - CC BY-SA 3.0
Hirschbiegel, Oliver
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Doremus, Robert Ogden, 1824-1906
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Wagner, Richard, 1813-1883
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US gov - Public Domain
Pasco, Samuel, 1834-1917
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Grisar, Albert, 1808-1869
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D'Amato, Alfonse
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Haupt, Herman, 1817-1905