Image from Wikimedia Commons
author unknown - Public Domain
unknown - Public Domain
Biblioteca del Congreso Nacional -
Compilation and editing supervised by Cuyler Reynolds. - Public Domain
unknown -
Martina Judt -
Public Domain
Unknown: credited to "NOAA" - Public Domain
L. R. Hamersly Co. (New York, NY), publisher. - Public Domain
the Oxford Dictionary of National Biography - Public Domain
Heinrich Klaffs - CC BY-SA 2.0
Richard Saltonstall Greenough (1819-1904). Daderot took this photograph. - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Image from Wikimedia Commons
Charlton, John, 1829-1910
Image from Wikimedia Commons
author unknown - Public Domain
Bandera, Stepan, 1909-1959
Image from Wikimedia Commons
Agassiz, Alexander, 1835-1910
Image from Wikimedia Commons
Rivadavia, Bernardino, 1780-1845
Image from Wikimedia Commons
Starr, Leonard
Image from Wikimedia Commons
Stevenson, Robert, 1772-1850
Image from Wikimedia Commons
unknown - Public Domain
Evans, Thomas Wiltberger, 1823-1897
Image from Wikimedia Commons
Biblioteca del Congreso Nacional -
Piñera Echenique, José
Image from Wikimedia Commons
Poor, Enoch, 1736-1780
Image from Wikimedia Commons
Gilbert, Bradford L. (Bradford Lee), 1853-1911
Image from Wikimedia Commons
Compilation and editing supervised by Cuyler Reynolds. - Public Domain
Sanford, John, 1803-1857
Image from Wikimedia Commons
Crawford, Joan, 1908-1977
Image from Wikimedia Commons
unknown -
Lehmann, Rosamond, 1901-1990
Image from Wikimedia Commons
Martina Judt -
Hrdlicka, Alfred, 1928-2009
Image from Wikimedia Commons
Larrea, Juan
Image from Wikimedia Commons
Arriaga, Manuel de 1840-1917
Image from Wikimedia Commons
Jewitt, Llewellynn Frederick William, 1816-1886
Image from Wikimedia Commons
Public Domain
Simon, Joseph, 1851-1935
Image from Wikimedia Commons
unknown - Public Domain
Wilson, Charles Erwin, 1890-1961
Image from Wikimedia Commons
Unknown: credited to "NOAA" - Public Domain
Alden, James, 1810-1877
Image from Wikimedia Commons
L. R. Hamersly Co. (New York, NY), publisher. - Public Domain
Singiser, T. F. (Theodore Frelinghuysen), 1845-1907
Image from Wikimedia Commons
Baird, Tadeusz
Image from Wikimedia Commons
Crespi, Giovanni Battista
Image from Wikimedia Commons
the Oxford Dictionary of National Biography - Public Domain
Müller, F. Max (Friedrich Max), 1823-1900
Image from Wikimedia Commons
Heinrich Klaffs - CC BY-SA 2.0
Walker, T-bone, 1910-1975
Image from Wikimedia Commons
Aletter, Frank, 1926-
Image from Wikimedia Commons
Legarda, Benito, 1853-1915
Image from Wikimedia Commons
Richard Saltonstall Greenough (1819-1904). Daderot took this photograph. - Public Domain
Greenough, Richard S. (Richard Saltonstall), 1819-1904
Image from Wikimedia Commons
Mathew Brady Levin Corot Handy - Public Domain
Watson, Lewis F. (Lewis Findlay), 1819-1890
Image from Wikimedia Commons
Fulks, Robbie