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anonymous - Public Domain
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Carlo Pellegrini - Public Domain
unknown - Public Domain
Masoncheek - CC BY-SA 4.0
Lincoln Ellsworth - Public Domain
Luisalvaz - CC BY-SA 4.0
F. Baruch - Public Domain
Alfred Wegener - CC BY-SA 4.0
Ingmark - Public Domain
Franklin L. Riley. - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
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Bailey, F.M. (Frederick Marshman), 1882-1967
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anonymous - Public Domain
Giordani, Tommaso, 1733?-1806
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Parrish, Maxfield, 1870-1966
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Backhouse, Edward, 1808-1879
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Fraser, Carol Hoorn, 1930-
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Carlo Pellegrini - Public Domain
Harrowby, Dudley Ryder, Earl of, 1831-1900
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Gisborne, F. N. (Frederick Newton), 1824-1892
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Glendower, Owen, approximately 1354-1416
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unknown - Public Domain
Lincecum, Gideon, 1793-1874
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Ueberroth, Peter.
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Lesberg, Jack
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Masoncheek - CC BY-SA 4.0
Friedman, Tom, 1965-....
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Tipu Sultan, Fath ʻAli, Nawab of Mysore, 1753-1799
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Malcolm, Ian, Sir, 1868-1944
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Lincoln Ellsworth - Public Domain
Polar Star (Airplane)
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Muggleton, Lodowick, 1609-1698
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Gregory XV, Pope, 1554-1623
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Luisalvaz - CC BY-SA 4.0
Ruelas, Julio, 1870-1907
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Gibson, William, 1948-....
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F. Baruch - Public Domain
Rose, Edmund, 1836-1914
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Alfred Wegener - CC BY-SA 4.0
Braitenberg, Valentino
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Walpole, Hugh, 1884-1941
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Ingmark - Public Domain
Coventry, Keith, 1958-....
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Szulkin, Piotr, 1950-...
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Franklin L. Riley. - Public Domain
Claiborne, J. F. H. (John Francis Hamtramck), 1809-1884
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Nelson, Willie, 1933-
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Blake, Edward, 1833-1912
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George Grantham Bain Collection (Library of Congress) - Public Domain
Shipley, A. E. (Arthur Everett), Sir, 1861-1927
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Elssler, Thérèse 1808-1878
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Gillot, Claude, 1673-1722