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Sailko - CC BY-SA 3.0
original uploader - Public Domain
Evstafiev - Public Domain
Unknown - Public Domain
Jean-Baptiste Descamps - Public Domain
https://www.flickr.com/photos/punktoad - CC BY 2.0
original author and copyright not listed, digitized by Google Books (https://books.google.com/books?id=9ltNAAAAYAAJ&pg=PA470&dq=polo+%22j.m.+waterbury%22&hl=en&ei=h3GRTLs5gvjwBtPb6NsG&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC4Q6AEwATge#v=onepage&q=polo%20%22j.m.%20waterbury%22&f=false) - Public Domain
user at project - CC BY-SA 3.0
Public Domain
Paparazzo Presents - CC BY-SA 3.0
unknown - Public Domain
Henry L. Chase - Public Domain
Stadtmuseum Münster -
Elliott & Fry - Public Domain
Harris & Ewing -
Vysotsky - CC BY-SA 4.0
National Photo Company Collection (Library of Congress) - Public Domain
IainP - CC BY-SA 3.0
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Sailko - CC BY-SA 3.0
Anacreon
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original uploader - Public Domain
Elliott, Sarah Barnwell, 1848-1928
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Renaud, Maurice, 1861-1933
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Clarendon, George William Frederick Villiers, Earl of, 1800-1870
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Butler, Guy, 1918-2001
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Evstafiev - Public Domain
Pachauri, R. K.
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Unknown - Public Domain
Fürstner, Carl, 1848-1906
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Jean-Baptiste Descamps - Public Domain
Brandmuller, Gregor
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https://www.flickr.com/photos/punktoad - CC BY 2.0
Weitz, Paul, 1966-....
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original author and copyright not listed, digitized by Google Books (https://books.google.com/books?id=9ltNAAAAYAAJ&pg=PA470&dq=polo+%22j.m.+waterbury%22&hl=en&ei=h3GRTLs5gvjwBtPb6NsG&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC4Q6AEwATge#v=onepage&q=polo%20%22j.m.%20waterbury%22&f=false) - Public Domain
Berry, Martha, 1866-1942
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Boëly, Alexandre Pierre François, 1785-1858
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Lindsey, Theophilus, 1723-1808
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user at project - CC BY-SA 3.0
Sellars, Peter
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Wolfke, Mieczysław (1883-1947).
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Public Domain
Davidson, John, 1887-1968
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Paparazzo Presents - CC BY-SA 3.0
Robertson, Pat.
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Ford, Whitey, 1928-
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unknown - Public Domain
Bartoletti, Bruno
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Howard, John Eliot, 1807-1883
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Henry L. Chase - Public Domain
Ii, John Papa
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Bateson, William, 1861-1926
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Stadtmuseum Münster -
Montgomery, Edmund, 1835-1911
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Elliott & Fry - Public Domain
Freeman, Edward Augustus, 1823-1892
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Harris & Ewing -
Reed, Stanley Forman, 1884-1980
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Tharaud, Jean, 1877-1952
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Marriott, J. Willard (John Willard), 1900-1985
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Vysotsky - CC BY-SA 4.0
Dykes, J. Oswald (James Oswald), 1835-1912
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Edison, Charles A., 1890-1969
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National Photo Company Collection (Library of Congress) - Public Domain
Adams, Harriet Chalmers, 1875-1937
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IainP - CC BY-SA 3.0
Ginger