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PopCultureGeek.com - CC BY 2.0
Leo Bensemann - CC BY 2.0
Lalupa - Public Domain
unknown - Public Domain
Christoferos1111 - CC BY-SA 4.0
Bailey, James M. - Public Domain
Robinson & Thompson Ltd; searches have been unable to identify the specific photographer. These included in the book within which the image was published, general internet searches and through the National Portrait Gallery database (no listing) -
US Government Printing Office - Public Domain
RobCelebHeights - CC BY-SA 4.0
Olnnu -
Tonylundman - CC BY-SA 3.0
Willard, O.H. - Public Domain
World Economic Forum - CC BY-SA 2.0
Tom Marcello - CC BY-SA 2.0
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PopCultureGeek.com - CC BY 2.0
Campbell, Martin
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Leo Bensemann - CC BY 2.0
Bensemann, Leo Vernon
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Szulkin, Piotr, 1950-...
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Slenczynska, Ruth, 1925-
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Gladwyn, Hubert Miles Gladwyn Jebb, Baron, 1900-1996
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Lalupa - Public Domain
Fèa, Carlo, 1753-1836
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unknown - Public Domain
Watson, Sereno, 1826-1892
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Ucicky, Gustav, 1899-1961
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Christoferos1111 - CC BY-SA 4.0
Bogaert, Evert Willemsz., 1607-1647
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Opatoshu, Joseph, 1886-1954
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Bailey, James M. - Public Domain
Bailey, James M. (James Montgomery), 1841-1894
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Hooke, N. (Nathaniel), 1690?-1763
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Robinson & Thompson Ltd; searches have been unable to identify the specific photographer. These included in the book within which the image was published, general internet searches and through the National Portrait Gallery database (no listing) -
Butler, George, 1819-1890
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Slaughter, Enos, 1916-
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Reszke, Edouard de 1853-1917
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US Government Printing Office - Public Domain
McSpadden, Clem, 1925-2008
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RobCelebHeights - CC BY-SA 4.0
Sarandon, Chris
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Powell, J. Enoch (John Enoch), 1912-1998
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Olnnu -
Lavachery, Henri, 1885-1972
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Schorr, Friedrich, 1888-1953
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Cramer, Franz, 1772-1848
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Tonylundman - CC BY-SA 3.0
Eliasson, Anders, 1947-2013
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Willard, O.H. - Public Domain
Allen, George, 1808-1876
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World Economic Forum - CC BY-SA 2.0
Levin, Richard C.
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Smith, Ozzie
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unknown - Public Domain
Methuen, Algernon, 1856-1924
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Tom Marcello - CC BY-SA 2.0
Wayne, Chuck
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Kung, H. H. (Hsiang-hsi), 1880-1967
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unknown - Public Domain
Duncan, W. A. (William Augustine), 1811-1885
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Apel, Hans, 1932-2011