Image from Wikimedia Commons
Bain - Public Domain
unknown - Public Domain
Nadar Upload and restoration by Jebulon - CC0 1.0
Jaontiveros -
Photo by Maurice Seymour, Chicago. - Public Domain
NASA - Public Domain
Jay Godwin - Public Domain
Gilbert Stuart - Public Domain
original uploader - Public Domain
Leonhard Rauwolf (1535-1596) - Public Domain
William G. Jackman<br/>Scan: Kevin Bryant - Public Domain
Scollings26 - CC BY-SA 4.0
Public Domain
Unattributed - Public Domain
Image from Wikimedia Commons
Kennedy, Alex. B. W. (Alexander Blackie William), 1847-1928
Image from Wikimedia Commons
Pergolesi, Giovanni Battista, 1710-1736
Image from Wikimedia Commons
Bain - Public Domain
O'Hare, Kate Richards, 1877-1948
Image from Wikimedia Commons
unknown - Public Domain
Stoddard, J. W. (John Williams), 1837-1917
Image from Wikimedia Commons
Gómez, José Miguel, 1858-1921
Image from Wikimedia Commons
Gilfillan, George, 1813-1878
Image from Wikimedia Commons
Nadar Upload and restoration by Jebulon - CC0 1.0
Luigini, A. (Alexandre), 1850-1906
Image from Wikimedia Commons
Crabbe, George, 1754-1832
Image from Wikimedia Commons
unknown - Public Domain
Garvin, J. L. (James Louis), 1868-1947
Image from Wikimedia Commons
Jaontiveros -
Ramos Arizpe, Miguel, 1775-1843
Image from Wikimedia Commons
Photo by Maurice Seymour, Chicago. - Public Domain
Stockwell, Harry
Image from Wikimedia Commons
Grainger, Percy
Image from Wikimedia Commons
Smith, Lawrence J. (Lawrence Jack), 1941-
Image from Wikimedia Commons
NASA - Public Domain
Fletcher, James Chipman, 1919-1991
Image from Wikimedia Commons
Jay Godwin - Public Domain
Leifer, Neil
Image from Wikimedia Commons
unknown - Public Domain
Sansevero, Raimondo di Sangro, principe di, 1710-1771
Image from Wikimedia Commons
Gilbert Stuart - Public Domain
Knox, Henry, 1750-1806
Image from Wikimedia Commons
Gage, Thomas, 1721-1787
Image from Wikimedia Commons
original uploader - Public Domain
Schop, Johann
Image from Wikimedia Commons
Penn, William, 1644-1718
Image from Wikimedia Commons
Leonhard Rauwolf (1535-1596) - Public Domain
Rauwolf, Leonhard, approximately 1540-1596
Image from Wikimedia Commons
Gherardo, da Cremona, 1113 or 1114-1187
Image from Wikimedia Commons
William G. Jackman<br/>Scan: Kevin Bryant - Public Domain
Lever, Charles James, 1806-1872
Image from Wikimedia Commons
Scollings26 - CC BY-SA 4.0
Fisher, Roy, 1930-....
Image from Wikimedia Commons
unknown - Public Domain
Ritner, Joseph, 1780-1869
Image from Wikimedia Commons
Berg, L. S. (Lev Semenovich), 1876-1950
Image from Wikimedia Commons
Kensett, John Frederick, 1816-1872
Image from Wikimedia Commons
Public Domain
Bennett, Clarence Edmund, 1833-1902
Image from Wikimedia Commons
Unattributed - Public Domain
Erben, Henry, 1832-1909
Image from Wikimedia Commons
Mallinger, Mathilde 1847-1920