Image from Wikimedia Commons
Jan Vilímek - Public Domain
slgckgc - CC BY 2.0
Étienne Carjat - Public Domain
Copyright owned by subject as a result of a work-for-hire arrangement - CC BY-SA 3.0
unknown - Public Domain
Friedrich Müller - Public Domain
Mingle Media TV - CC BY-SA 2.0
Thierry Caro - CC BY-SA 3.0
Henry Bone (1755-1834) - Public Domain
Association of Graduates of the United States Military Academy. Published by Seeman & Peters (Saginaw, MI). - Public Domain
Unknown (Mondadori Publishers) -
Image from Wikimedia Commons
Jan Vilímek - Public Domain
Tichatschek, Josef, 1807-1886
Image from Wikimedia Commons
Obama, Barack, 1961-
Image from Wikimedia Commons
Boyd, Stephen, 1931-1977
Image from Wikimedia Commons
Pickman, Dudley Leavitt, 1779-1846
Image from Wikimedia Commons
slgckgc - CC BY 2.0
Philips, Emo
Image from Wikimedia Commons
Étienne Carjat - Public Domain
Braga, Gaetano, 1829-1907
Image from Wikimedia Commons
Gemini VII (Spacecraft)
Image from Wikimedia Commons
Hullah, John, 1812-1884
Image from Wikimedia Commons
Suffield, Harbord Harbord, Baron, 1734-1810
Image from Wikimedia Commons
Clement XII, Pope, 1652-1740
Image from Wikimedia Commons
Copyright owned by subject as a result of a work-for-hire arrangement - CC BY-SA 3.0
Kusatsu, Clyde 1948-....
Image from Wikimedia Commons
unknown - Public Domain
Stickley, Gustav, 1858-1942
Image from Wikimedia Commons
Levasseur, Émile, 1828-1911
Image from Wikimedia Commons
unknown - Public Domain
Lafargue, Laura Marx
Image from Wikimedia Commons
Seamans, Robert Channing, 1918-2008
Image from Wikimedia Commons
Zeeland, Paul van, 1893-1973
Image from Wikimedia Commons
Osborne, Henry Zenas, 1848-1923
Image from Wikimedia Commons
Friedrich Müller - Public Domain
Knote, Heinrich, 1870-1953
Image from Wikimedia Commons
Mingle Media TV - CC BY-SA 2.0
Hurley, Elizabeth
Image from Wikimedia Commons
Thierry Caro - CC BY-SA 3.0
Quivrin, Jocelyn
Image from Wikimedia Commons
Blacker, C. P. (Charles Paton), 1895-1975
Image from Wikimedia Commons
Portier, Michael, 1795-1859
Image from Wikimedia Commons
Henry Bone (1755-1834) - Public Domain
Bloomfield, Robert, 1766-1823
Image from Wikimedia Commons
Ditko, Steve.
Image from Wikimedia Commons
Hopkins, Stephen, 1707-1785
Image from Wikimedia Commons
Association of Graduates of the United States Military Academy. Published by Seeman & Peters (Saginaw, MI). - Public Domain
Birkhimer, William E. (William Edward), 1848-1914
Image from Wikimedia Commons
Blake, Robert, 1599-1657
Image from Wikimedia Commons
Berber, Anita, 1898 or 1899-1928
Image from Wikimedia Commons
Unknown (Mondadori Publishers) -
Lefèvre, Raymond 1929-2008
Image from Wikimedia Commons
Redpath, John, 1796-1869