Image from Wikimedia Commons
Unknown war photographer - Public Domain
Georges Biard - CC BY-SA 3.0
Biographical Directory of the United States Congress - Public Domain
not stated - Public Domain
Matthew Duchesne - CC BY 3.0
jeffdunncom - CC BY 2.0
Public Domain
W. Graham Boss - Public Domain
US Government - Public Domain
Patvann - CC BY-SA 3.0
:en:White Watson - CC BY-SA 2.0
IsraelinUSA - CC BY 2.0
unknown - Public Domain
Robinson, Christine H. and w - Public Domain
Staff member of the University of Queensland Photography Department - CC BY-SA 4.0
US Gov - Public Domain
Elisa Cabot - CC BY-SA 2.0
Roscoe C. E. Brown, Ray B. Smith - Public Domain
Photographer unidentified - Public Domain
Image from Wikimedia Commons
Unknown war photographer - Public Domain
Wickersham, Cornelius W. (Cornelius Wendell), 1884-
Image from Wikimedia Commons
Georges Biard - CC BY-SA 3.0
Ducey, Caroline, 1977-
Image from Wikimedia Commons
Biographical Directory of the United States Congress - Public Domain
Felton, Rebecca Latimer, 1835-1930
Image from Wikimedia Commons
McGill, James, 1744-1813
Image from Wikimedia Commons
Cairo, Francesco, 1607-1665
Image from Wikimedia Commons
not stated - Public Domain
Paine, Albert Bigelow, 1861-1937
Image from Wikimedia Commons
Matthew Duchesne - CC BY 3.0
Hirst, J. B. (John Bradley)
Image from Wikimedia Commons
jeffdunncom - CC BY 2.0
Callaway, Ann Hampton
Image from Wikimedia Commons
Keller, Oscar Edward, 1878-1927
Image from Wikimedia Commons
Public Domain
Harrison, George Leslie, 1887-1958
Image from Wikimedia Commons
W. Graham Boss - Public Domain
Anderson, Robert Rowand, Sir, 1834-1921
Image from Wikimedia Commons
US Government - Public Domain
Harmon, Millard Fillmore, 1888-1945
Image from Wikimedia Commons
Bernie, Ben, 1891-1943
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Southwell, Robert, Saint, 1561?-1595
Image from Wikimedia Commons
Patvann - CC BY-SA 3.0
Powe, B. W. (Bruce W.), 1955-
Image from Wikimedia Commons
:en:White Watson - CC BY-SA 2.0
Farey, John, 1766-1826
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Todd, Thelma, 1905-1935
Image from Wikimedia Commons
Liebe, Christian, 1654-1708
Image from Wikimedia Commons
IsraelinUSA - CC BY 2.0
Blitzer, Wolf
Image from Wikimedia Commons
unknown - Public Domain
Woodruff, Timothy L. (Timothy Lester), 1858-1913
Image from Wikimedia Commons
Ritter, Alexander, 1833-1896
Image from Wikimedia Commons
Robinson, Christine H. and w - Public Domain
McKay, Emma Ray, 1877-1970
Image from Wikimedia Commons
Staff member of the University of Queensland Photography Department - CC BY-SA 4.0
Hay, John A., 1942-
Image from Wikimedia Commons
US Gov - Public Domain
Sternberg, George Miller, 1838-1915
Image from Wikimedia Commons
Elisa Cabot - CC BY-SA 2.0
Gil de Biedma, Jaime, 1929-1990
Image from Wikimedia Commons
Roscoe C. E. Brown, Ray B. Smith - Public Domain
Wadsworth, James Wolcott, 1846-1926
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Photographer unidentified - Public Domain
Fuchs, Vivian, Sir
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O'Neil, Barbara, 1910-1980
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Rutherford, Alexander Cameron, 1857-1941
Image from Wikimedia Commons
Janauschek, Fanny 1829-1904