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danxoneil - CC BY 2.0
Anthonis van Dyck - Public Domain
unknown - Public Domain
Smithsonian Institution -
Allan warren - CC BY-SA 3.0
Charles Schmid, Executive Director of the Acoustical Society of America - Public Domain
Wilhelm Benque, photographe Ernest Flammarion-Paris-editor and publisher of book - Public Domain
original uploader -
Origafoundation - CC BY-SA 3.0
No coneguts - Public Domain
Rob Crawford - CC BY-SA 2.0
See the Commons:OTRS - CC BY-SA 4.0
*:File:Martine_Aubry_-_avril_2012_(3).jpg - CC BY-SA 2.0
GO69 - Public Domain
Peter Augustus Porter (1853-1925) - Public Domain
James H. Smith, author. Hume H. Cale and William E. Roscoe, assistants. D. Mason & Co. (Syracuse, NY), publisher. - Public Domain
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danxoneil - CC BY 2.0
White, John H., 1945-
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Anthonis van Dyck - Public Domain
Bruegel, Pieter, 1564-1638
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unknown - Public Domain
Gaines, Myra Clark, 1805-1885
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Smithsonian Institution -
Leone, Lucile Petry, 1902-1999
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Allan warren - CC BY-SA 3.0
Courtenay, Tom
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Hardenberg, Albert, approximately 1510-1574
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Charles Schmid, Executive Director of the Acoustical Society of America - Public Domain
Hartmann, William M.
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Wilhelm Benque, photographe Ernest Flammarion-Paris-editor and publisher of book - Public Domain
Chabas, Paul-Émile 1869-1937
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original uploader -
Hart, George W. (George William), 1955-
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Origafoundation - CC BY-SA 3.0
Kane, Bob
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Lull, Richard Swann, 1867-1957
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No coneguts - Public Domain
Briot, Charles, 1817-1882
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Rob Crawford - CC BY-SA 2.0
Stanley, Ralph
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Spark, Debra, 1962-
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See the Commons:OTRS - CC BY-SA 4.0
Carter, Steven, 1956-
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unknown - Public Domain
Baglivi, Giorgio, 1668-1707
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Rosoman, Leonard
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Appleton, Daniel, 1785-1849
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Babeuf, Gracchus, 1760-1797
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*:File:Martine_Aubry_-_avril_2012_(3).jpg - CC BY-SA 2.0
Aubry, Martine, 1950 August 8-
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Araja, Francesco
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Marshall, W. L. (William Louis), 1846-1920
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Hale, Frederick, 1874-1963
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GO69 - Public Domain
Severus, Sulpicius
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Muni, Paul, 1895-1967
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Hinojosa, Rubén, 1940-
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Peter Augustus Porter (1853-1925) - Public Domain
Porter, Peter A. (Peter Augustus), 1853-1925
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West, James E. (James Elton), 1951-2006
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Gouvy, Th. (Théodore), 1819-1898
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James H. Smith, author. Hume H. Cale and William E. Roscoe, assistants. D. Mason & Co. (Syracuse, NY), publisher. - Public Domain
Carpenter, B. Platt (Benjamin Platt), 1837-