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National Park Service - Public Domain
unknown - Public Domain
''The Port Folio'', Dec 1814, Volume 4, #6 - Public Domain
Not stated - Public Domain
Public Domain
user at project -
Bain News Service - Public Domain
sthenry71 - CC BY-SA 2.0
Nv8200p - CC BY-SA 3.0
U.S. Navy - Public Domain
Abraham Blooteling (1640-1690), after unknown artist - Public Domain
Gerardus Mercator - Public Domain
Hans Holzer - Public Domain
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National Park Service - Public Domain
Carpenter, Liz
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Church, Francis Pharcellus, 1839-1906
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Nicholls, Francis T. (Francis Tillou), 1834-1912
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unknown - Public Domain
Clifford, Clark M., 1906-1998
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unknown - Public Domain
Drelincourt, Charles, 1595-1669
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''The Port Folio'', Dec 1814, Volume 4, #6 - Public Domain
Elliott, Jesse D. (Jesse Duncan), 1782-1845
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Not stated - Public Domain
Church, Robert Reed, 1839-1912
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Public Domain
Cutler, Manasseh, 1742-1823
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user at project -
Patterson, P. J. (Percival James), 1935-
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Barron, Samuel, 1809-1888
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Felsenstein, Joseph
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Rea, David, 1831-1901
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Brassey, Thomas Brassey, Earl, 1836-1918
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Arumäus, Dominicus, 1579-1637
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Whitman, Marcus, 1802-1847
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Bain News Service - Public Domain
McVey, Sam, 1884-1921
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sthenry71 - CC BY-SA 2.0
Kuhn, Mona, 1969-....
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Nv8200p - CC BY-SA 3.0
McBride, James, 1957-
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Terry, David Smith, 1823-1889
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Bernheim, Ernst, 1850-1942
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unknown - Public Domain
Bishop, Elizabeth, 1911-1979
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Wharton, George, Sir, 1617-1681
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U.S. Navy - Public Domain
Polk, George, 1913-1948
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Escosura, Patricio de la 1807-1878
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Abraham Blooteling (1640-1690), after unknown artist - Public Domain
Derby, Charles Stanley, Earl of, 1628-1672
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Meiklejohn, Alexander, 1872-1964
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Gerardus Mercator - Public Domain
Hondius, Jodocus, 1563-1612
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Halas, George, 1895-1983
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Schweitzer, Anton, 1735-1787
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Hans Holzer - Public Domain
Holzer, Hans, 1920-2009