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unknown - Public Domain
Francis Cotes (1726-1770) - Public Domain
Purdy - Public Domain
Johns Hopkins University - Public Domain
Ramón Pérez - Public Domain
Aartevo - CC BY-SA 3.0
Public Domain
NBC Television - Public Domain
Henry Chase - Public Domain
Charles Tuttle - Public Domain
William Percy - Public Domain
Saint-Memin - Public Domain
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Meadows, Joseph Kenny, 1790-1874
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Smith, Francis, 1671?-1738
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Ludlow, William, 1843-1901
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Folin, Otto, 1867-1934
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unknown - Public Domain
Mathsson, Bruno, 1907-1988
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Dearborn, Benjamin, 1754-1838
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Francis Cotes (1726-1770) - Public Domain
Pigot, Robert
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Purdy - Public Domain
Crothers, Samuel McChord, 1857-1927
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unknown - Public Domain
Knight, E. F. (Edward Frederick), 1852-1925
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Ferrari, León, 1920-2013
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Davison, Michael S. (Michael Shannon), 1917-2006
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Johns Hopkins University - Public Domain
Wroth, Lawrence C. (Lawrence Counselman), 1884-1970
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Ley, Robert, -1945
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Ramón Pérez - Public Domain
Allende, Ignacio, 1769-1811
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Grosvenor, Cyrus Pitt, 1792-1879
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Everest, George, Sir, 1790-1866
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Aartevo - CC BY-SA 3.0
Lestié, Alain, 1944-....
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Public Domain
Williamson, James Cassius, 1845-1913
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NBC Television - Public Domain
Allen, Dayton
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Henry Chase - Public Domain
Robie, Frederick, 1822-1912
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Coustou, Guillaume, 1677-1746
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Charles Tuttle - Public Domain
Willard, George, 1824-1901
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Albergati Capacelli, Francesco, 1728-1804
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Coislin, Pierre du Cambout de, Cardinal, Bishop of Orléans, 1636-1706
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unknown - Public Domain
Reed, Myrtle, 1874-1911
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Public Domain
Núñez de Arce, Gaspar, 1834-1903
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William Percy - Public Domain
Waugh, Edwin, 1817-1890
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Saint-Memin - Public Domain
Grain, Peter, 1785 or 1786-1857
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unknown - Public Domain
Stanmore, Arthur Hamilton-Gordon, Baron, 1829-1912
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Butterfield, Billy, 1917-1988