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S. J. Clarke Pub. Co., Chicago, IL, 1901 - Public Domain
Conny Liegl - CC BY 2.0
Jens Christian Roseland - Public Domain
Public Domain
Kim Traynor - CC BY-SA 4.0
Georges Biard - CC BY-SA 3.0
Tom Marcello - CC BY-SA 2.0
Peter Holler - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Ml99 - CC BY-SA 3.0
en - Public Domain
Harris & Ewing - Public Domain
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Benchill - CC BY-SA 3.0
Vernissagefan - CC BY 3.0
*:File:Robert_Hope-Jones.jpg - Public Domain
Jules Beau - Public Domain
Philkon - Public Domain
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S. J. Clarke Pub. Co., Chicago, IL, 1901 - Public Domain
Curtis, George Martin, 1844-1921
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Conny Liegl - CC BY 2.0
Swayze, Patrick
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Jens Christian Roseland - Public Domain
Preus, Herman Amberg, 1825-1894
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Kondrashin, Kirill
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Public Domain
Wylie, Elinor, 1885-1928
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Price, E. Hoffmann
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Davis, Frederic E. (Frederic Emery)
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Kim Traynor - CC BY-SA 4.0
Thompson, E.P. (Edward Palmer), 1924-1993
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Georges Biard - CC BY-SA 3.0
Valentino, 1932-
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Tom Marcello - CC BY-SA 2.0
Labarbera, Joe
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Peter Holler - Public Domain
Porter, David Rittenhouse, 1788-1867
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Public Domain
Engelhardt, Zephyrin, 1851-1934
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Mathew Brady Levin Corot Handy - Public Domain
Slater, Jas. H. (James Harvey), 1826-1899
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Ml99 - CC BY-SA 3.0
Jurinac, Sena, 1921-2011
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en - Public Domain
Orlov, Grigoriĭ Grigorʹevich, graf, 1734-1783
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Harris & Ewing - Public Domain
Sabath, Adolph Joachim, 1866-1952
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Gage Skidmore - CC BY-SA 3.0
Kearns, Anthony
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Coverdale, Miles, 1488-1568
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Benchill - CC BY-SA 3.0
Tremain, Garrick
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Vernissagefan - CC BY 3.0
Mack, Heinz, 1931-....
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*:File:Robert_Hope-Jones.jpg - Public Domain
Hope-Jones, Robt. (Robert), 1859-1914
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Stephens, John Walter, 1834-1870
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Holdich, Thomas Hungerford, Sir, 1843-1929
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Stokes, John Lort, 1811-1885
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Huntington, George S. (George Sumner), 1861-1927
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Gaulli, Giovanni Battista, 1639-1709
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Hamilton, John M., 1847-1905
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Jules Beau - Public Domain
Delahaye, Émile
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Wood, Garfield Arthur, 1880-1971
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Philkon - Public Domain
Newton, Juice