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unknown - Public Domain
Alyssa Almeida Duncan - CC BY-SA 4.0
Llouj - CC BY-SA 3.0
Joop van Bilsen / Anefo - CC BY-SA 3.0
Public Domain
Hugo Schmölz - Public Domain
"Cox" (no further information from source) - Public Domain
Unknown - Public Domain
DR - CC BY-SA 2.0
US Department of State - Public Domain
NASA - Public Domain
It is unclear as to whether the press-materials were distributed by Gebel-William's personal publicity agency or by :en:Ringling Bros. and Barnum & Bailey Circus - Public Domain
J. Hubert - Public Domain
summonedbyfells - CC BY 2.0
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unknown - Public Domain
Le Coq, Albert von 1860-1930
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unknown - Public Domain
Saba, Umberto, 1883-1957
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LaMonte, Karen, 1967-
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Belmont, François Vachon de, 1645-1732
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Kefauver, Estes, 1903-1963
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MacDonald, J. Farrell, 1875-1952
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Alyssa Almeida Duncan - CC BY-SA 4.0
Ford, Daniel, 1931-
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Pigault-Lebrun, 1753-1835
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Johnston, Olin D. (Olin Dewitt), 1896-1965
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Nöldeke, Theodor, 1836-1930
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Llouj - CC BY-SA 3.0
Menino, Thomas
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Colt, Le Baron Bradford, 1846-1924
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Barrow, Edward Grant, 1868-1953
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Joop van Bilsen / Anefo - CC BY-SA 3.0
Dreifuss, Arthur, 1908-1993
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Public Domain
Barante, Amable-Guillaume-Prosper Brugière, baron de, 1782-1866
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Hugo Schmölz - Public Domain
Böhm, Dominikus, 1880-1955
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"Cox" (no further information from source) - Public Domain
McCutcheon, John T.
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Banti, Cristiano, 1824-1904
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Unknown - Public Domain
Butler, William Orlando, 1791-1880
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DR - CC BY-SA 2.0
Maspero, François, 1932-
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La Trémoille, Louis de II, 1460-1525
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US Department of State - Public Domain
Swindler, Mary Hamilton, 1884-1967
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Dale, Alan, 1926-2002
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NASA - Public Domain
White, Edward Higgins, II, 1930-1967
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It is unclear as to whether the press-materials were distributed by Gebel-William's personal publicity agency or by :en:Ringling Bros. and Barnum & Bailey Circus - Public Domain
Gebel-Williams, Gunther, 1934-2001
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J. Hubert - Public Domain
Macleay, William, Sir, 1820-1891
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Pombal, Sebastião José de Carvalho e Melo, Marqués de 1699-1782
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summonedbyfells - CC BY 2.0
Paterson, Don, 1963-....
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Lacome, P. (Paul), 1838-1920
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Faith, Percy