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unknown U.S. government photographer (still from video at government HHS symposium) - Public Domain
Jacob Henry Hall - Public Domain
Juntas - CC BY-SA 3.0
Hans Schlereth (1897–1962) - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Public Domain
Original uploader was Flask - Public Domain
Smithsonian Institution -
unknown - Public Domain
Kadellar - CC BY-SA 4.0
gdcgraphics -
Yeza - CC BY-SA 3.0
Ragesoss - CC BY-SA 3.0
Georges Biard - CC BY-SA 3.0
Alisa82 - CC BY-SA 3.0
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Flanagin, Harris, 1817-1874
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unknown U.S. government photographer (still from video at government HHS symposium) - Public Domain
Blumenthal, David, 1948-....
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Jacob Henry Hall - Public Domain
Rexford, Eben E. (Eben Eugene), 1848-1916
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Juntas - CC BY-SA 3.0
Lopes-Graça, Fernando, 1906-1994
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Hans Schlereth (1897–1962) - Public Domain
Davis, James J. (James John), 1873-1947
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Mathew Brady Levin Corot Handy - Public Domain
McDill, James Wilson, 1834-1894
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Avery, William T. (William Tecumsah), 1819-1880
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Kerr, Alfred, 1867-1948
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Doolittle, James Harold, 1896-1993
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Public Domain
Morton, Marcus, 1819-1891
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Zeno, Carlo, 1334-1418
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Martin, Theodore, sir., 1816-1909
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Original uploader was Flask - Public Domain
Rogers, Robert, 1731-1795
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Smithsonian Institution -
Harrington, John Peabody
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unknown - Public Domain
Beman, Amos Gerry, 1812-1874
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Kadellar - CC BY-SA 4.0
Coixet, Isabel
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unknown - Public Domain
Stone, William J. (William Johnson), 1841-1923
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Wright, Nathan, Sir, 1654-1721
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Ingersoll, Robert Green, 1833-1899
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gdcgraphics -
Smith, Charles Martin
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Mathew Brady Levin Corot Handy - Public Domain
Kellogg, William Pitt, 1831-1918.
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Boorman, John, 1933-....
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Public Domain
Westmorland, Mildmay Fane, Earl of, 1601-1666
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unknown - Public Domain
Jodrell, Richard Paul, 1745-1831
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Yeza - CC BY-SA 3.0
Paz, Abel
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Ragesoss - CC BY-SA 3.0
Galison, Peter, 1955-
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Hamilton, Elizabeth, 1756?-1816
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Georges Biard - CC BY-SA 3.0
Moretti, Nanni
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Alisa82 - CC BY-SA 3.0
Jones, Francis R., 1955-....
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Lasker, Emanuel, 1868-1941