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Donald MacKinnon - Public Domain
see here for details: http://digitalgallery.nypl.org/nypldigital/id?1169097 - Public Domain
Contemporary portrait - Public Domain
Ray V. Pierce - Public Domain
Orrin Chalfant Painter, Photographed by H.L. Perkins, December 20, 1896 - Public Domain
Herbert A. French - Public Domain
Horace Edwin Hayden, author. E. B. Yordy (Wilkes-Barre, PA), printer. - Public Domain
andrew kidman - Public Domain
NBC Television - Public Domain
Public Domain
user at project - Public Domain
True, Alfred Charles, 1853-1929 - Publisher: Washington, U.S. Govt. print. off. - Public Domain
unknown - Public Domain
Amerikana - CC BY-SA 4.0
Freie Interessengemeinschaft für Grenz- und Geisteswissenschaften und Ufologiestudien, CH-8495 Schmidrüti - CC BY-SA 2.5
Image from Wikimedia Commons
Donald MacKinnon - Public Domain
Mackinnon, Donald, 1839-1914
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Ludwig Chronegk
Image from Wikimedia Commons
see here for details: http://digitalgallery.nypl.org/nypldigital/id?1169097 - Public Domain
Giuliani, Mauro, 1781-1829
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Karajan, Herbert von
Image from Wikimedia Commons
Contemporary portrait - Public Domain
Tucker, Henry St. George, 1874-1959
Image from Wikimedia Commons
Ray V. Pierce - Public Domain
Pierce, R. V. (Ray Vaughn), 1840-1914
Image from Wikimedia Commons
Orrin Chalfant Painter, Photographed by H.L. Perkins, December 20, 1896 - Public Domain
Painter, William, 1838-1906
Image from Wikimedia Commons
Herbert A. French - Public Domain
MacMillan, Donald Baxter, 1874-1970
Image from Wikimedia Commons
Horace Edwin Hayden, author. E. B. Yordy (Wilkes-Barre, PA), printer. - Public Domain
Scott, William L. (William Lawrence), 1828-1891
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Massera, Emilio E.
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Scheidt, Samuel, 1587-1654
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Harriton, Abraham, 1893-1986.
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andrew kidman - Public Domain
Clarke, Andrew, 1824-1902
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Lynch, John, 1917-1999
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Blake, William, 1757-1827
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Keeler, James Edward, 1857=1900
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NBC Television - Public Domain
Best, James, 1926-....
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Ollivier, Emile, 1825-1913
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Wilkes, John, 1725-1797
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Public Domain
Carroll, Joseph F. (Joseph Francis), 1910-1991
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Ruppersberg, Allen 1944-
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user at project - Public Domain
Rhodes Hall (Atlanta, Ga.)
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Rains, Claude, 1889-1967
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Muldoon, R. D. (Robert David), 1921-1992
Image from Wikimedia Commons
True, Alfred Charles, 1853-1929 - Publisher: Washington, U.S. Govt. print. off. - Public Domain
True, Alfred Charles, 1853-1929
Image from Wikimedia Commons
unknown - Public Domain
Charles, Rajah of Sarawak, 1829-1917
Image from Wikimedia Commons
Peck, Dallas L. (Dallas Lynn), 1929-
Image from Wikimedia Commons
Amerikana - CC BY-SA 4.0
Bugas, John S. (John Stephen), 1908-
Image from Wikimedia Commons
Luria, Elaine, 1975-
Image from Wikimedia Commons
Freie Interessengemeinschaft für Grenz- und Geisteswissenschaften und Ufologiestudien, CH-8495 Schmidrüti - CC BY-SA 2.5
Meier, Eduard