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National Geographic Society - Public Domain
E. T. A. Hoffmann - Public Domain
Frederick Sargent - Public Domain
unknown - Public Domain
The Cyclopedia Publishing Company, Calcutta -
Anna Creech - CC BY-SA 2.0
No conegut - Public Domain
Ed Kavishe for http://www.fashionwirepress.com/ - CC BY 3.0
original uploader - Public Domain
CBS Television - Public Domain
Cesare Maccari - Public Domain
Jens Vajen - CC BY-SA 4.0
MarielMarshall - CC BY-SA 3.0
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
Augustus Lukeman - Public Domain
US War Department - Public Domain
George Henry Whittemore - Public Domain
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Phyfe, Duncan, 1768-1854
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National Geographic Society - Public Domain
Gore, James Howard, 1856-1939
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E. T. A. Hoffmann - Public Domain
Hoffmann, E.T.A. (Ernst Theodor Amadeus), 1776-1822
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Weisskopf, Victor Frederick, 1908-2002
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Haas, Robert, 1886-1960
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Fattori, Giovanni, 1825-1908
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Frederick Sargent - Public Domain
Bagot, William Bagot, Baron, 1811-1887
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Webb, DeWitt, 1839 or 1840-1917
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Morris, Adrian, 1929-2004
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unknown - Public Domain
Kuznet︠s︡ov, N. G. (Nikolaĭ Gerasimovich), 1902-1974
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The Cyclopedia Publishing Company, Calcutta -
Travers, Morris William, 1872-
Image from Wikimedia Commons
Anna Creech - CC BY-SA 2.0
Bern, Dan
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No conegut - Public Domain
Watson, H. W. (Henry William), 1827-1903
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Ed Kavishe for http://www.fashionwirepress.com/ - CC BY 3.0
Cavalli, Roberto
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original uploader - Public Domain
Merensky, Hans, 1871-1952
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CBS Television - Public Domain
Martin, Dick, 1922-2008
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Hoagland, Peter
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Cesare Maccari - Public Domain
Catiline, approximately 108 B.C.-62 B.C.
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Jens Vajen - CC BY-SA 4.0
Kropinski, Uwe
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Willis, Richard Storrs, 1819-1900
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MarielMarshall - CC BY-SA 3.0
Urquhart, Tony
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Krogh, Egil, 1939-
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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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Fouts, Roger.
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Augustus Lukeman - Public Domain
George, James Z. (James Zachariah), 1826-1897
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Harrwitz, Daniel, 1823-1884
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US War Department - Public Domain
Hubbell, William Stone, 1837-1930
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Lukács György 1865-1950
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Hodgson, James D., 1915-2012
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George Henry Whittemore - Public Domain
Hackett, Horatio B. (Horatio Balch), 1808-1875