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unknown - Public Domain
:de:Auguste Hüssener - Public Domain
No photographer credited in original source. - Public Domain
not stated - Public Domain
Bain News Service, publisher - Public Domain
J. Aitken, No 14 Castle Street, Leicester Fields (publisher) - Public Domain
Leo Joseph Muir - Public Domain
Karel van Mallery - Public Domain
Siebbi - CC BY 3.0
Mathew Brady - Public Domain
PBS-Public Broadcasting System - Public Domain
Susanne Diesner - CC BY-SA 4.0
Ahmad Shahin - Public Domain
Francisco Pacheco - Public Domain
Heron112 - CC BY-SA 3.0
Image from Wikimedia Commons
unknown - Public Domain
Daintree, Richard, 1832-1878
Image from Wikimedia Commons
Gregory, William Henry, Sir, 1817-1892
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:de:Auguste Hüssener - Public Domain
Cheri, Rose
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No photographer credited in original source. - Public Domain
Christie, Winifred, 1882-1965
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not stated - Public Domain
MacHale, John, 1791-1881
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unknown - Public Domain
Axtell, Samuel B. (Samuel Beach), 1819-1891
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Bain News Service, publisher - Public Domain
Brookings, Robert S. (Robert Somers), 1850-1932
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Castro, José, 1807-1860
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Amherst, William Amhurst Tyssen-Amherst, Baron, 1835-1909
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Vestal, Albert H. (Albert Henry), 1875-1932
Image from Wikimedia Commons
J. Aitken, No 14 Castle Street, Leicester Fields (publisher) - Public Domain
Thicknesse, Philip, 1719-1792
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unknown - Public Domain
Hymans, Paul, 1865-1941
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Olin, Laurie
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Leo Joseph Muir - Public Domain
Cowley, Matthew, 1897-1953
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Forsyth, William, 1854-1935
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Conway, Henry Seymour, 1721-1795
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Karel van Mallery - Public Domain
Barclay, William, 1546 or 1547-1608
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Tischbein, Johann Heinrich Wilhelm, 1751-1829
Image from Wikimedia Commons
Siebbi - CC BY 3.0
Daldry, Stephen
Image from Wikimedia Commons
Mathew Brady - Public Domain
Ruffin, Thomas, 1820-1863
Image from Wikimedia Commons
PBS-Public Broadcasting System - Public Domain
Loud, Lance, 1951-2001
Image from Wikimedia Commons
Susanne Diesner - CC BY-SA 4.0
Eggert, Moritz, 1965-
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Aubrac, Raymond
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unknown - Public Domain
Sprague, Rosetta Douglass, 1839-1906
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Anderson, William Black, 1830-1901
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Adair, John, 1757-1840
Image from Wikimedia Commons
Ahmad Shahin - Public Domain
El-Baz, Farouk, 1938-
Image from Wikimedia Commons
Francisco Pacheco - Public Domain
Guerrero, Francisco, 1528?-1599
Image from Wikimedia Commons
Heron112 - CC BY-SA 3.0
Losoya, Toribio, 1808-1836
Image from Wikimedia Commons
Elmer, Lucius Q. C. (Lucius Quintius Cincinnatus), 1793-1883