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Public Domain
Chemical Engineer - CC BY-SA 4.0
unknown - Public Domain
w:de:Benutzer:Bedrich - Public Domain
NARA-Author -
Photographer uncredited - Public Domain
John Penniman, artist. George Snyder, lithographer. - Public Domain
Imogen Cunningham -
Konrad Jacobs - CC BY-SA 3.0
Studio White, New York (George Grantham Bain Collection, Library of Congress) - Public Domain
Thesupermat - CC BY-SA 3.0
Janboek - CC BY-SA 4.0
William Linton - Public Domain
Bain - Public Domain
Gregory Reddick - CC BY-SA 4.0
Lucius E. Chittenden - Public Domain
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Public Domain
Sweeney, Charles W.
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Chemical Engineer - CC BY-SA 4.0
Hadfield, Robert A. (Robert Abbott), 1858-1940
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Flint, Charles Louis, 1824-1889
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unknown - Public Domain
Wallace, W. H. (William Henson), 1811-1879
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w:de:Benutzer:Bedrich - Public Domain
Maestlin, Michael, 1550-1631
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NARA-Author -
Eisenhower, David, 1948-
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unknown - Public Domain
Hiller, Hiram Milliken 1867-1921
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Photographer uncredited - Public Domain
Whiteman, Paul, 1890-1967
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unknown - Public Domain
Telcs, Ede, 1872-1948
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unknown - Public Domain
Desbordes-Valmore, Marceline, 1786-1859
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Thiselton-Dyer, William T. (William Turner), 1843-1928
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John Penniman, artist. George Snyder, lithographer. - Public Domain
Walsh, Mike, 1810-1859
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Maeztu, Ramiro De
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Imogen Cunningham -
Chinn, Benjamen, 1921-2009
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Konrad Jacobs - CC BY-SA 3.0
Possel, René de 1905-1974
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Studio White, New York (George Grantham Bain Collection, Library of Congress) - Public Domain
Esmond, H. V. (Henry V.), 1869-1922
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Thesupermat - CC BY-SA 3.0
Cabot, Meg
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Zuccarelli, Francesco, 1702-1788
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Janboek - CC BY-SA 4.0
Ellul, Jacques, 1912-1994
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Misaubin, Jean, 1673-1734
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William Linton - Public Domain
Linton, William, 1791-1876
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Roberts, Jane, 1929-1984
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unknown - Public Domain
Sauppe, Hermann, 1809-1893
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Keichline, Anna, 1889-1943
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Pasta, Giuditta Maria Costanza, 1797-1865
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Bain - Public Domain
Edwards, Clarence Ransom, 1860-1931
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Gregory Reddick - CC BY-SA 4.0
Grube, Nikolai.
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Public Domain
Jones, Charles William, 1834-1897
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Lucius E. Chittenden - Public Domain
Chittenden, L. E. (Lucius Eugene), 1824-1900
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Bunn, William Malcolm, 1842-1923