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SRI International - CC BY-SA 3.0
User Matt Crypto -
anonymous - Public Domain
Devi Prasad. -
Francis Engleheart (1775-1849), Engraver - Public Domain
unknown - Public Domain
George Richmond - Public Domain
Erling Mandelmann - CC BY-SA 3.0
Anefo - CC0 1.0
National Photo Company - Public Domain
Kunstverlag Louis Pernitzsch, Leipzig - Public Domain
Castilloz - CC BY-SA 3.0
Mike Lewis - CC BY 2.0
Public Domain
Unknown photographer (not specified in book) -
Hugo Erfurth - Public Domain
sinaloaarchivohistorico -
Nv8200p - CC BY-SA 3.0
Bain - Public Domain
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SRI International - CC BY-SA 3.0
Gibson, Weldon B., 1917-
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User Matt Crypto -
Zimmermann, Philip (Philip R.)
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anonymous - Public Domain
Keith, B. F. (Benjamin Franklin), 1846-1914
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Oberth, Hermann, 1894-1989
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Zarchi, Nurit
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Ochman, Wiesław
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Devi Prasad. -
Lester, Muriel, 1883-1968
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Sherman, Charles Robert, 1788-1829
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Francis Engleheart (1775-1849), Engraver - Public Domain
Aikin, John, 1747-1822
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unknown - Public Domain
Webb, Mary, 1881-1927
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George Richmond - Public Domain
Teignmouth, John Shore, Baron, 1751-1834
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Granito Pignatelli di Belmonte, Gennaro, 1851-1948
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Erling Mandelmann - CC BY-SA 3.0
Rougemont, Denis de 1906-1985
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Anefo - CC0 1.0
McLean, Franklin C. (Franklin Chambers), 1888-
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Ward, Seth, 1617-1689
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National Photo Company - Public Domain
Sackett, Frederic M.
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Kunstverlag Louis Pernitzsch, Leipzig - Public Domain
Brugmann, Karl, 1849-1919
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Castilloz - CC BY-SA 3.0
Rocha, Roberto de la
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Mike Lewis - CC BY 2.0
Hensley, John, 1977-...
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Elon, Menachem
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Public Domain
Lane, Lafayette, 1842-1896
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Bessemer, Henry, Sir, 1813-1898
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Unknown photographer (not specified in book) -
Ore, Øystein, 1899-1968
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Arria, Diego
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Hugo Erfurth - Public Domain
Dix, Otto, 1891-1969
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sinaloaarchivohistorico -
Bergamín, José, 1895-1983
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Du Pont, Alfred Victor, 1798-1856
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Nv8200p - CC BY-SA 3.0
Giardina, Anthony.
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Bain - Public Domain
Pearson, E. J., 1863-1928
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Augereau, Pierre, 1757-1816