Image from Wikimedia Commons
Saint-Mémin, Charles Balthazar Julien Fevret de, 1770-1852, artist - Public Domain
Mathew Brady - Public Domain
Franmarie Metzler - Public Domain
Benjamin Robert Haydon - Public Domain
unknown but in 1900s - Public Domain
Thatcher Cook for PopTech - CC BY-SA 2.0
Public Domain
Gustave Hensel Studio - Public Domain
Engraved by C. Cook from a drawing by Maurir[http://ihm.nlm.nih.gov/images/B04579] - Public Domain
Jeff Hitchcock - CC BY 2.0
anonymous - Public Domain
National Photo Company - Public Domain
CC BY 2.0
Министерство обороны Российской Федерации -
unknown - Public Domain
Dan Harasymchuk - CC BY-SA 4.0
Samuel Bellin Thomas Barber - Public Domain
Leslie Ward -
original artwork by Franklin McMahon, a living artist who has granted CCAS 3.0 permissions for this image. - CC BY-SA 3.0
Aldercraft - CC BY-SA 3.0
Image from Wikimedia Commons
Gassendi, Pierre, 1592-1655
Image from Wikimedia Commons
Barling, Harry Gilbert, Sir, 1855-1940
Image from Wikimedia Commons
Saint-Mémin, Charles Balthazar Julien Fevret de, 1770-1852, artist - Public Domain
Winder, William Henry, 1775-1824
Image from Wikimedia Commons
Mathew Brady - Public Domain
Bayley, James Roosevelt, 1814-1877
Image from Wikimedia Commons
Vaast, Saint, Bishop of Arras, approximately 453-540
Image from Wikimedia Commons
Franmarie Metzler - Public Domain
Houlahan, Chrissy, 1967-
Image from Wikimedia Commons
Benjamin Robert Haydon - Public Domain
Cadbury, Richard Tapper, 1768-1860
Image from Wikimedia Commons
unknown but in 1900s - Public Domain
Howes, Edith, 1872-1954
Image from Wikimedia Commons
Thatcher Cook for PopTech - CC BY-SA 2.0
Bair, Sheila
Image from Wikimedia Commons
Public Domain
Armstrong, Harry G. (Harry George), 1899-1983
Image from Wikimedia Commons
Gustave Hensel Studio - Public Domain
De Cora, Angel, 1871-1919
Image from Wikimedia Commons
Engraved by C. Cook from a drawing by Maurir[http://ihm.nlm.nih.gov/images/B04579] - Public Domain
Chevreul, M. E. (Michel Eugène), 1786-1889
Image from Wikimedia Commons
Raymond, Eric S.
Image from Wikimedia Commons
Jeff Hitchcock - CC BY 2.0
Gale, Lorena
Image from Wikimedia Commons
anonymous - Public Domain
Lovett, Josephine
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National Photo Company - Public Domain
Rice, Grantland, 1880-1954
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CC BY 2.0
Ritchie, Dennis M., 1941-2011
Image from Wikimedia Commons
Министерство обороны Российской Федерации -
Pokryshkin, Aleksandr Ivanovich
Image from Wikimedia Commons
unknown - Public Domain
Foulke, William Dudley, 1848-1935
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unknown - Public Domain
Ormsbee, Ebenezer J. (Ebenezer Jolls), 1834-1924
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Dan Harasymchuk - CC BY-SA 4.0
MacDonald, Ann-Marie, 1958-
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Bourbon, Charles De, Comte De Soissons
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unknown - Public Domain
Douai, Adolf, 1819-1888
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Samuel Bellin Thomas Barber - Public Domain
Latrobe, Christian Ignatius, 1758-1836
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Leslie Ward -
Newnes, George, 1851-1910
Image from Wikimedia Commons
Hole, S. Reynolds (Samuel Reynolds), 1819-1904
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Bullock, Susan, 1958-
Image from Wikimedia Commons
original artwork by Franklin McMahon, a living artist who has granted CCAS 3.0 permissions for this image. - CC BY-SA 3.0
Mcmahon, Franklin
Image from Wikimedia Commons
Aldercraft - CC BY-SA 3.0
Adler, Hans, 1904-1979
Image from Wikimedia Commons
Dove, Heinrich-Wilhelm, 1803-1879