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unknown - Public Domain
Public Domain
Archives New Zealand - CC BY 2.0
:en:Pierre Jean David - Public Domain
Asa Park - Public Domain
James E. Purdy - Public Domain
Georges Seguin (Okki - CC BY-SA 3.0
The Govle - Public Domain
Lincoln Ellsworth - Public Domain
Edjs - CC BY-SA 3.0
Gorupdebesanez - CC BY-SA 3.0
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Blunt, Wilfrid Scawen, 1840-1922
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Hadley, Arthur Twining, 1856-1930
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unknown - Public Domain
Bortkiewicz, Sergei, 1877-1952
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Public Domain
Anderson, Charles, 1814-1895
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Signac, Paul, 1863-1935
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Archives New Zealand - CC BY 2.0
Amin, Idi, 1925-2003
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:en:Pierre Jean David - Public Domain
Latouche, Henri de 1785-1851
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unknown - Public Domain
Earl, Robert, 1824-1902
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Du Ponceau, Peter Stephen, 1760-1844
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unknown - Public Domain
Prentice, George D. (George Denison), 1802-1870
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unknown - Public Domain
Theorell, Hugo
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Léandre, Joëlle
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Asa Park - Public Domain
Birney, James Gillespie, 1792-1857
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Tulasne, Louis-René (1815-1885).
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Jones, John Winter, 1805-1881
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James E. Purdy - Public Domain
Hitchcock, Ethan Allen, 1835-1909
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Giotto, 1266?-1337
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Georges Seguin (Okki - CC BY-SA 3.0
Delaney, Joseph, 1945-....
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The Govle - Public Domain
Aldrich, Lucy T. (Lucy Truman), 1869-1955
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Marbury, Elisabeth, 1856-1933
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Has, Wojciech J. (Wojciech Jerzy), 1925-2000
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Lincoln Ellsworth - Public Domain
Polar Star (Airplane)
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Davis, Spencer
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unknown - Public Domain
Derricotte, Juliette, 1897-1931
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Edjs - CC BY-SA 3.0
Silverberg, Robert
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Delesse, A. (Achille), 1817-1881
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Gorupdebesanez - CC BY-SA 3.0
Del Monte, Peter
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Public Domain
Maclay, William, 1737-1804
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unknown - Public Domain
Doppler, Karl, 1825-1900
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Llwyd, Humphrey, 1527-1568