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unknown - Public Domain
Adelphi University - Public Domain
Paul McIlroy -
Slowking -
Estrella Díaz - Public Domain
Christian Sahm - CC BY-SA 2.0
Jean Miele -
Stephen Swofford -
Jürgen Martens - Public Domain
Sailko - CC BY 3.0
self scanned; photographer not named in source - Public Domain
Geraldshields11 - CC BY-SA 3.0
Jacob Hilsdorf - Public Domain
Ronald L. Rivest - CC BY-SA 4.0
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Tchaikovsky, Peter Ilich, 1840-1893
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Sicard, M. l'abbé (Roch Ambroise Cucurron), 1742-1822
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unknown - Public Domain
Lutyens, Mary, 1908-1999
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Russell, A. P. (Addison Peale), 1826-1912
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Grillparzer, Franz, 1791-1872
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Canfield, James Hulme, 1847-1909
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Gilbert, Joseph Henry, 1817-1901
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Schopenhauer, Johanna, 1766-1838
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Adelphi University - Public Domain
Levermore, Charles H. (Charles Herbert), 1856-1927
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Paul McIlroy -
Baxter, Jim, -2001
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Slowking -
Elliott, Laura, 1957-
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unknown - Public Domain
Newell, William A. (William Augustus), 1817-1901
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Roberts, William, Sir, 1830-1899
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Bohr, Harald August, 1887-1951
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Morrow, Buddy
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Estrella Díaz - Public Domain
Quiñones, Samuel R.
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Christian Sahm - CC BY-SA 2.0
Rudd, Roswell
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Leickert, Charles, 1816-1907
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North, Roger, 1651-1734
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Jean Miele -
Rogers, Michael, 1935-....
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Orsini, Paolo Giordano 1
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Stephen Swofford -
Goldwyn, Tony
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Jürgen Martens - Public Domain
Sala, Angelus, 1576-1637
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Sailko - CC BY 3.0
Magliabechi, Antonio, 1633-1714
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Quigley, James Edward, 1855-1915
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self scanned; photographer not named in source - Public Domain
Roig, Gonzalo, 1890-1970
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Geraldshields11 - CC BY-SA 3.0
Grinspoon, David Harry.
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Jacob Hilsdorf - Public Domain
Flechtheim, Alfred
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Ronald L. Rivest - CC BY-SA 4.0
Rivest, Ronald L.
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Giddings, Marsh, 1816-1875