Image from Wikimedia Commons
Julian Vannerson (1827-1875) - Public Domain
Unattributed - Public Domain
Moshe Pridan - Public Domain
*:File:Alexandre_Alekhine_01.jpg - Public Domain
Caulfieldh - CC BY-SA 3.0
Public Domain
unknown - Public Domain
anonymous -
Isaac Hutton - Public Domain
Bain News Service, publisher - Public Domain
Anne Whitney - Public Domain
original uploader - Public Domain
NASA - Public Domain
unknown -
John Ramspott - CC BY 2.0
Compilation - Public Domain
Image from Wikimedia Commons
Sterkel, Johann Franz Xaver
Image from Wikimedia Commons
Julian Vannerson (1827-1875) - Public Domain
Foster, Stephen C. (Stephen Clark), 1799-1872
Image from Wikimedia Commons
Terauchi, Masatake, 1852-1919
Image from Wikimedia Commons
Haraszthy, Agoston, 1812-1869
Image from Wikimedia Commons
Unattributed - Public Domain
Dupré, Marcel, 1886-1971
Image from Wikimedia Commons
Moshe Pridan - Public Domain
Billotte, Pierre, 1906-1992
Image from Wikimedia Commons
*:File:Alexandre_Alekhine_01.jpg - Public Domain
Alekhine, Alexander, 1892-1946
Image from Wikimedia Commons
Caulfieldh - CC BY-SA 3.0
Caan, James.
Image from Wikimedia Commons
Public Domain
Mongkut, King of Siam, 1804-1868
Image from Wikimedia Commons
Reuter, Enzio
Image from Wikimedia Commons
unknown - Public Domain
Antommarchi, F. (Francesco), 1780-1838
Image from Wikimedia Commons
anonymous -
Horváth, Ödön von, 1901-1938
Image from Wikimedia Commons
Isaac Hutton - Public Domain
Ten Broeck, Dirck, 1765-1833
Image from Wikimedia Commons
Public Domain
Hamlin, Cyrus, 1839-1867
Image from Wikimedia Commons
Bain News Service, publisher - Public Domain
Cline, Maggie, 1857-1934
Image from Wikimedia Commons
Anne Whitney - Public Domain
Palmer, George Herbert, 1842-1933
Image from Wikimedia Commons
Assmann, Jan
Image from Wikimedia Commons
original uploader - Public Domain
Davis, George, 1820-1896
Image from Wikimedia Commons
Pratt, Anne, 1806-1893
Image from Wikimedia Commons
Nichols, Chas. A. (Charles Archibald), 1876-1920
Image from Wikimedia Commons
Rodenbough, Theophilus F. (Theophilus Francis), 1838-1912
Image from Wikimedia Commons
unknown - Public Domain
Prescott, A. B. (Albert Benjamin), 1832-1905
Image from Wikimedia Commons
Collier, Tom, 1840-1891
Image from Wikimedia Commons
unknown - Public Domain
Higgins, Godfrey, 1773-1833
Image from Wikimedia Commons
Jacobus Philippus, Bergomensis, 1434-1520
Image from Wikimedia Commons
NASA - Public Domain
Pierce, John R. (John Robinson), 1910-2002
Image from Wikimedia Commons
unknown -
Leale, Charles A. (Charles Augustus), 1842-1932
Image from Wikimedia Commons
John Ramspott - CC BY 2.0
Uelsmann, Jerry, 1934-....
Image from Wikimedia Commons
Compilation - Public Domain
Adams, Francis William Lauderdale, 1862-1893
Image from Wikimedia Commons
Fitzgerald, Edward, 1809-1883