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copyright holder: Bayoumi - CC BY-SA 3.0
F darkbladeus - Public Domain
Idko - CC BY-SA 3.0
Blaues Sofa - CC BY 2.0
Dorothy Tindale - Public Domain
Kimberly, W.B. (compiler) -
Naval Postgraduate School - Public Domain
Chicago Daily News, Inc., photographer. - Public Domain
unknown -
Chemical Engineer - CC BY-SA 4.0
wikipedia:George Dance the Younger - Public Domain
unknown - Public Domain
Njkmoore - CC BY-SA 4.0
Not clear - Public Domain
U.S. Government Printing Office. - Public Domain
Robert Drepaul - CC BY 2.0
Not stated - Public Domain
Photograph published in the 1902 Encyclopedia Britannica - Public Domain
Thesupermat - CC BY-SA 3.0
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Saint, Eva Marie, 1924-....
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copyright holder: Bayoumi - CC BY-SA 3.0
Bayoumi, Moustafa.
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F darkbladeus - Public Domain
Osbourne, Ozzy, 1948-
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Idko - CC BY-SA 3.0
Casteret, Norbert, 1897-?
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Vaile, William Newell, 1876-1927
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Blaues Sofa - CC BY 2.0
Fest, Joachim C., 1926-2006
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Dorothy Tindale - Public Domain
Tindale, Norman B. (Norman Barnett), 1900-1993
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Kimberly, W.B. (compiler) -
Lindsay, David, 1856-1922
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Naval Postgraduate School - Public Domain
Hayes-Roth, Frederick
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Chicago Daily News, Inc., photographer. - Public Domain
Yost, Fielding Harris, 1871-1946
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unknown -
Abbott, Edwin Abbott, 1838-1926
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Chemical Engineer - CC BY-SA 4.0
Hadfield, Robert A. (Robert Abbott), 1858-1940
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wikipedia:George Dance the Younger - Public Domain
Gilpin, Sawrey, 1733-1807
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unknown - Public Domain
Seashore, Carl E. (Carl Emil), 1866-1949
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unknown - Public Domain
Brown, Ada
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Fernández de Córdoba, Gonzalo, 1453-1515
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Njkmoore - CC BY-SA 4.0
Barabashov, N. P. (Nikolaĭ Pavlovich)
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Dyer, David P. (David Patterson), 1838-1924
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Farwell, George, Sir, 1845-1915
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Vrolik, W. (Willem), 1801-1863
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Not clear - Public Domain
Chapin, Anna Alice, 1880-1920
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U.S. Government Printing Office. - Public Domain
Stalbaum, Lynn E. (Lynn Ellsworth), 1920-1999
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unknown - Public Domain
Finch Hatton, Denys George, 1887-1931
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Robert Drepaul - CC BY 2.0
Hunt, David, 1942-....
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Serlio, Sebastiano, 1475-1554?
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Not stated - Public Domain
Matthews, Brander, 1852-1929
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Photograph published in the 1902 Encyclopedia Britannica - Public Domain
Alford, Henry, 1810-1871
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Bourgery, J.M. (Jean Marc), 1797-1849
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unknown - Public Domain
Allen, Viola, 1867-1948
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Thesupermat - CC BY-SA 3.0
Auteuil, Daniel