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original uploader - Public Domain
unknown - Public Domain
No photographer credited. - Public Domain
George Byrd - CC BY-SA 3.0
Bain - Public Domain
Public Domain
Sławek - CC BY-SA 2.0
Geriarto - CC BY-SA 3.0
US Government Printing Office - Public Domain
Pe-Jo -
Robert Taylor - Public Domain
original uploader -
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Blatnik, John Anton, 1911-1991
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original uploader - Public Domain
Ohm, Georg Simon, 1789-1854
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Price, Richard, 1723-1791
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unknown - Public Domain
Gerstaecker, A. (Adolph), 1828-1895
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unknown - Public Domain
Kapodistrias, Iōannēs Antōniou, 1776-1831
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original uploader - Public Domain
Svevo, Italo, 1861-1928
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No photographer credited. - Public Domain
Montgomery, Helen Barrett, 1861-1934
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original uploader - Public Domain
Hebberd, Robert W. (Robert William), 1857-
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George Byrd - CC BY-SA 3.0
Byrd, George, 1926-2010
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Russell, Bertrand, 1872-1970
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Bolland, Adrienne, 1895-1975
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Bain - Public Domain
King-Hall, Stephen, Sir, 1893-1966
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Winnington Ingram, Arthur F. (Arthur Foley), 1858-1946
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Public Domain
Reed, David Aiken, 1880-1953
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Sławek - CC BY-SA 2.0
Falk, Feliks
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Carolan, Turlough, 1670-1738
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Geriarto - CC BY-SA 3.0
Caro, Rodrigo, 1573-1647?
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Adams, Francis, 1796-1861
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US Government Printing Office - Public Domain
Eckhardt, Bob.
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Browne, William, 1692-1774
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Pe-Jo -
Amadeo, Giovanni Antonio, approximately 1447-1522
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Bransfield, Edward, -1852
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Ryder, Mitch
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Canfield, Gordon, 1898-1972
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Robert Taylor - Public Domain
Taylor, Robert, 1784-1844
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Allen, John Weston, 1872-1942
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Rondon, Cândido Mariano da Silva, 1865-1958
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Boucher, Rick, 1946-
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Public Domain
Wells, Charles, 1786-1866
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original uploader -
Thrall, Arthur, 1926-