Image from Wikimedia Commons
unknown - Public Domain
unidentified photographer - Public Domain
Aimé Dupont - Public Domain
Street, Robert, 1796-1865, lithographer. - Public Domain
jlggb - CC BY 2.0
Anonymous - Public Domain
Michurst - CC BY-SA 3.0
Georges Biard - CC BY-SA 3.0
Earl Morse Wilbur (?) - Public Domain
TimDuncan - CC BY 3.0
User at project link - Public Domain
John Bradley Winslow (1851-1920), author. T. H. Flood & Company (Chicago, IL), publisher. - Public Domain
Altamontstreet - CC BY-SA 4.0
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
U.S. Air Force - Public Domain
Image from Wikimedia Commons
unknown - Public Domain
Southgate, William Wright, 1800-1849
Image from Wikimedia Commons
unidentified photographer - Public Domain
Ganne, Louis, 1862-1923
Image from Wikimedia Commons
Aimé Dupont - Public Domain
Rehan, Ada, 1857-1916
Image from Wikimedia Commons
Street, Robert, 1796-1865, lithographer. - Public Domain
Russell, Henry, 1812-1900
Image from Wikimedia Commons
jlggb - CC BY 2.0
Vilar, Jean, 1912-1971
Image from Wikimedia Commons
Caubère, Philippe, 1950-
Image from Wikimedia Commons
Anonymous - Public Domain
Stratton, F. J. M.
Image from Wikimedia Commons
Michurst - CC BY-SA 3.0
Millard, Oscar
Image from Wikimedia Commons
unknown - Public Domain
Petterssen, Sverre, 1898-
Image from Wikimedia Commons
Wylie, Andrew, 1789-1851
Image from Wikimedia Commons
unknown - Public Domain
Evans, Arthur Herbert, 1890-1944
Image from Wikimedia Commons
Georges Biard - CC BY-SA 3.0
Cordy, Annie
Image from Wikimedia Commons
Jessup, Henry Harris, 1832-1910
Image from Wikimedia Commons
Esch, Marvin L. (Marvin Leonel), 1927-2010
Image from Wikimedia Commons
Heemskerck, Egbert van, 1634 or 1635-1704
Image from Wikimedia Commons
Earl Morse Wilbur (?) - Public Domain
Eliot, T. L. (Thomas Lamb), 1841-1936
Image from Wikimedia Commons
TimDuncan - CC BY 3.0
Martyn, John, 1948-2009
Image from Wikimedia Commons
User at project link - Public Domain
Servais, Jean, 1910-1976
Image from Wikimedia Commons
Gaucher, Charles-Étienne, 1741-1804
Image from Wikimedia Commons
Tokarzewski-Karaszewicz, Michał Tadeusz, 1892-
Image from Wikimedia Commons
Panufnik, Andrzej
Image from Wikimedia Commons
John Bradley Winslow (1851-1920), author. T. H. Flood & Company (Chicago, IL), publisher. - Public Domain
Hubbell, Levi, 1808-1876
Image from Wikimedia Commons
unknown - Public Domain
Moses, Franklin Israel, 1838-1906
Image from Wikimedia Commons
Altamontstreet - CC BY-SA 4.0
Cloepfil, Brad
Image from Wikimedia Commons
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
Williams, Jeremiah Norman, 1829-1915
Image from Wikimedia Commons
unknown - Public Domain
Recklinghausen, Friedrich von, 1833-1910
Image from Wikimedia Commons
U.S. Air Force - Public Domain
Taylor, Robert P. (Robert Preston), 1909-1997
Image from Wikimedia Commons
Mason, James, 1909-1984
Image from Wikimedia Commons
unknown - Public Domain
Baillarger, Jules Gabriel François, 1809-1890
Image from Wikimedia Commons
Laozi