Image from Wikimedia Commons
trailer screenshot (United Artists) - DVD bonus - Public Domain
Ronald L Mallett, Research Professor of Physics, - CC BY-SA 4.0
Jeff Arbaugh and Kim Delaney - Public Domain
unknown - Public Domain
HurayforZay - CC BY-SA 4.0
Internet Archive Book Images - Public Domain
Amadscientist - CC BY-SA 3.0
James T. White & Company, New York - Public Domain
Henry de Montault - Public Domain
Thorleif Wardenær - CC BY-SA 3.0
Library of the London School of Economics and Political Science -
L. U. Reavis is the book's author. I couldn't find any specific citation for the illustrator - Public Domain
Image from Wikimedia Commons
trailer screenshot (United Artists) - DVD bonus - Public Domain
Simon, Michel, 1895-1975
Image from Wikimedia Commons
Pinheiro, Columbano Bordalo, 1857-1929
Image from Wikimedia Commons
Johnson, Walter, 1887-1946
Image from Wikimedia Commons
Kekulé, August, 1829-1896
Image from Wikimedia Commons
Ronald L Mallett, Research Professor of Physics, - CC BY-SA 4.0
Mallett, Ronald L.
Image from Wikimedia Commons
Duchovny, David
Image from Wikimedia Commons
Jeff Arbaugh and Kim Delaney - Public Domain
Vigoda, Abe, 1921-
Image from Wikimedia Commons
unknown - Public Domain
Gatto, Alfonso, 1909-1976
Image from Wikimedia Commons
HurayforZay - CC BY-SA 4.0
Rockefeller, Michael Clark
Image from Wikimedia Commons
Goodenough, Samuel, 1743-1827
Image from Wikimedia Commons
Internet Archive Book Images - Public Domain
Lorenzo, Monaco, 1370 or 1371-1425
Image from Wikimedia Commons
Vetemaa, Enn, 1936-....
Image from Wikimedia Commons
Amadscientist - CC BY-SA 3.0
Deakin, Edwin, 1838-1923
Image from Wikimedia Commons
Eddy, Manton S. (Manton Sprague), 1892-1962
Image from Wikimedia Commons
unknown - Public Domain
Lactantius, approximately 240-approximately 320
Image from Wikimedia Commons
Biermann, Aenne, 1898-1933
Image from Wikimedia Commons
James T. White & Company, New York - Public Domain
Wood, Bradford Ripley, 1800-1889
Image from Wikimedia Commons
Bradlaugh, Charles, 1833-1891
Image from Wikimedia Commons
Henry de Montault - Public Domain
Yriarte, Charles, 1832-1898
Image from Wikimedia Commons
Hlasiwetz, Heinrich, 1825-1875
Image from Wikimedia Commons
unknown - Public Domain
Ernst, Oswald H. (Oswald Herbert), 1842-1926
Image from Wikimedia Commons
unknown - Public Domain
Herreid, Charles N. (Charles Nelson), 1857-1928
Image from Wikimedia Commons
MacDonald, Malcolm, 1901-1981
Image from Wikimedia Commons
Thorleif Wardenær - CC BY-SA 3.0
Finne, Ferdinand, 1910-
Image from Wikimedia Commons
Gamewell, Francis Dunlap, 1857-1950
Image from Wikimedia Commons
Annaud, Jean-Jacques
Image from Wikimedia Commons
Library of the London School of Economics and Political Science -
Adams, Walter, 1906-
Image from Wikimedia Commons
L. U. Reavis is the book's author. I couldn't find any specific citation for the illustrator - Public Domain
Allen, Thomas, 1813-1882
Image from Wikimedia Commons
Mudie, C. E., 1818-1890
Image from Wikimedia Commons
unknown - Public Domain
Ritchie, Thomas, 1778-1854