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:de:Benutzer:Weltalf - Public Domain
unknown - Public Domain
Bureau of Industrial Service - Public Domain
Dan Harasymchuk - CC BY-SA 4.0
Maryother - CC BY-SA 4.0
Johann Dréo - CC BY-SA 2.0
W. T. Fry after J. Tannock - Public Domain
Fabvee - CC BY-SA 3.0
Unknown derivative work by JPS68 - Public Domain
J. W. Glass - Public Domain
L. U. Reavis is the book's author. I couldn't find any specific citation for the illustrator - Public Domain
Ragesoss - CC BY-SA 3.0
Dick DeMarsico, World Telegram staff photographer - Public Domain
ETH Zürich - CC BY-SA 3.0
Arturo Schwarz - CC BY-SA 3.0
original uploader - CC BY-SA 3.0
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:de:Benutzer:Weltalf - Public Domain
Alexander, de Villa Dei
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Rust, Johann Nepomuk, 1775-1840
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Bregović, Goran
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Bartolozzi, Francesco, 1727-1815
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unknown - Public Domain
Vanderburgh, Federal, 1788-1868
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Bureau of Industrial Service - Public Domain
Verdon, Gwen
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Dan Harasymchuk - CC BY-SA 4.0
Helm, Michael, 1961-
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Campillo y Cosío, José del, 1693-1743
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Haase, Friedrich, 1825-1911
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Rarick, John R., 1924-2009
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Maryother - CC BY-SA 4.0
Sciola, Pinuccio, 1942-....
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Johann Dréo - CC BY-SA 2.0
Nobre, Fernando, 1951-
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W. T. Fry after J. Tannock - Public Domain
Babington, William, 1756-1833
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Fabvee - CC BY-SA 3.0
Frank, Pierre
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Tuttle, Charles H. (Charles Henry), 1879-1971
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Denny, David Thomas
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Fama, Eugene F., 1939-....
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Unknown derivative work by JPS68 - Public Domain
Arnaldus, de Villanova, -1311
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Lantz, Walter
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J. W. Glass - Public Domain
Rolfe, John, 1585-1622
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L. U. Reavis is the book's author. I couldn't find any specific citation for the illustrator - Public Domain
Allen, Thomas, 1813-1882
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Ragesoss - CC BY-SA 3.0
Numbers, Ronald L.
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Pembroke, George Herbert, Earl of, 1850-1895
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Dick DeMarsico, World Telegram staff photographer - Public Domain
Feiffer, Jules
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ETH Zürich - CC BY-SA 3.0
Prelog, V. (Vladimir), 1906-1998
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Arturo Schwarz - CC BY-SA 3.0
Schwarz, Arturo, 1924-....
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Beaufort, Henry Somerset, Duke of, 1629-1700
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original uploader - CC BY-SA 3.0
Egorov, Youri
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Gummer, Don, 1946-....
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Cayce, Edgar, 1877-1945