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Pigsonthewing - CC BY-SA 4.0
CC BY 2.0
unknown - Public Domain
Moretto da Brescia - Public Domain
National Book League (Great Britain) - Public Domain
original uploader - Public Domain
US gov - Public Domain
Rafaldb - CC BY-SA 3.0
Gage Skidmore - CC BY-SA 3.0
Giancarlo Botti (1931-2009), italian photographer -
Scanned and digitized by Google Books, cropped by user Froggerlaura - Public Domain
Harris & Ewing photographer - Public Domain
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
NASA - Public Domain
Photographer:George Hoyt - Public Domain
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Pigsonthewing - CC BY-SA 4.0
Liversidge, Archibald, 1847-
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Tʻumanyan, Hovhannes, 1869-1923
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CC BY 2.0
Irving, Amy, 1953-....
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Wilde, Eduardo, 1844-1913
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unknown - Public Domain
Conolly, John, 1794-1866
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Moretto da Brescia - Public Domain
Mattioli, Pietro Andrea, 1501-1577
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National Book League (Great Britain) - Public Domain
Rice, Alice Caldwell Hegan, 1870-1942
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original uploader - Public Domain
Platter, Félix (1536-1614).
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US gov - Public Domain
Harris, Katherine, 1957-
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Foch, Ferdinand, 1851-1929
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Rafaldb - CC BY-SA 3.0
Cowley, J. M. (John Maxwell), 1923-
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Gage Skidmore - CC BY-SA 3.0
Curtis, Jamie Lee, 1958-
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Springer, Jerry, 1944-
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Gazzara, Ben, 1930-2012
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Kremer, Johann Paul, 1883-
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Harispe, Jean, 1768-1855
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Ségur, Pierre, marquis de, 1853-1916
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unknown - Public Domain
Arriaza, Juan Bautista, 1770-1837
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Giancarlo Botti (1931-2009), italian photographer -
Maccione, Aldo, 1935-...
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Scanned and digitized by Google Books, cropped by user Froggerlaura - Public Domain
Abbe, Robert, 1851-1928
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Lewis, John Frederick, 1805-1876.
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Harris & Ewing photographer - Public Domain
Arnold, Thurman Wesley, 1891-1969
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Searle, Ronald, 1920-2011
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Jacobsen, Carl Christian Hilmann, 1842-1914
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Brady-Handy Photograph Collection (Library of Congress) - Public Domain
Crebs, John Montgomery, 1830-1890
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NASA - Public Domain
Ochoa, Ellen, 1958-
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Ries, Ferdinand, 1784-1838
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Photographer:George Hoyt - Public Domain
Pusey, Nathan M. (Nathan Marsh), 1907-2001
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Easley, Michael F., 1950-
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O'Connor, Una, 1880-1959