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unknown - Public Domain
Unknown author - Public Domain
Marian Albright Schenk - Public Domain
Samuel Smith Kilburn - Public Domain
unknown photographer - Public Domain
Georges Biard - CC BY-SA 3.0
randy stewart - CC BY-SA 2.0
Unknown - adjustments by uploader - Public Domain
Jos van vliet - CC BY-SA 4.0
US Government Printing Office - Public Domain
William McQuaide - CC BY 3.0
George Grantham Bain Collection (Library of Congress) - Public Domain
Metro-Goldwy-Mayer - Public Domain
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unknown - Public Domain
Grossi, Tommaso, 1791-1853
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Unknown author - Public Domain
Jardine, William, 1800-1874
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Farrar, F.W. (Frederic William), 1831-1903
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Marian Albright Schenk - Public Domain
Mather, Stephen Tyng, 1867-1930
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Samuel Smith Kilburn - Public Domain
Ames, Joseph, 1816-1872
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unknown photographer - Public Domain
Cowen, Benjamin Rush, 1831-1908
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unknown - Public Domain
McMaster, John Bach, 1852-1932
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Brackenridge, H. H. (Hugh Henry), 1748-1816
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Martini, Francesco di Giorgio, 1439-1502
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Georges Biard - CC BY-SA 3.0
Seigner, Mathilde
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randy stewart - CC BY-SA 2.0
Burton, Levar
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Unknown - adjustments by uploader - Public Domain
Degeyter, Pierre
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Wells, Junior, 1934-1998
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Jos van vliet - CC BY-SA 4.0
Murray, Pauline, 1958-
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Peale, Sarah Miriam, 1800-1885
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US Government Printing Office - Public Domain
Mezvinsky, Edward M. (Edward Maurice), 1937-
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Woodbridge, William, 1780-1861
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James, Edward T.
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William McQuaide - CC BY 3.0
McKnight, Jay, 1931-
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George Grantham Bain Collection (Library of Congress) - Public Domain
Snowden, Philip Snowden, Viscount, 1864-1937
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Tyson, Edward, 1650-1708
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Harvey, Van Austin
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unknown - Public Domain
Kempe, A. B. (Alfred Bray), 1849-1922
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Gill, David, 1843-1914
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unknown - Public Domain
Davis, Jeff, 1862-1913
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Metro-Goldwy-Mayer - Public Domain
Lombard, Carole, 1908-1942
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Mahtab, Harekrushna, 1900-1987
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Oudry, Jean-Baptiste, 1686-1755
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Grasse, François Joseph Paul de Grasse, comte de, 1722-1788
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Owen, Orville Ward, 1854-1924