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Center for Jewish History, NYC - Public Domain
Rob C. Croes / Anefo - CC BY-SA 3.0
knudsentrust.org - Public Domain
Robert L. Knudsen - Public Domain
unknown - Public Domain
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
National Art Committee Metropolitan Museum of Art (New York, N.Y.) - Public Domain
Stephencdickson - CC BY-SA 4.0
Beesknees999 - CC BY-SA 3.0
Peabody Institute Library (Danvers, MA). - Public Domain
Public Domain
Rob McAlear - Public Domain
Napoleon Sarony - Public Domain
Brady-Handy Photograph Collection (Library of Congress) - Public Domain
David Shankbone - CC BY-SA 3.0
I, Sailko - CC BY-SA 3.0
George Dance - Public Domain
Don Coltman or Steffens Colmer - Public Domain
Image from Wikimedia Commons
Rice, William North, 1845-1928
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Center for Jewish History, NYC - Public Domain
Koussevitzky, Moshe, 1899-1966
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Rob C. Croes / Anefo - CC BY-SA 3.0
Cox, Harvey Gallagher
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knudsentrust.org - Public Domain
Knudsen, Valdemar, -1898
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Robert L. Knudsen - Public Domain
Sawyer, Grant, 1918-1996
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unknown - Public Domain
Vieu, Jane
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Bonner, Hypatia Bradlaugh, 1858-1935
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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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National Art Committee Metropolitan Museum of Art (New York, N.Y.) - Public Domain
Hopkinson, Charles, 1869-1962
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Stephencdickson - CC BY-SA 4.0
Millar, John, 1735-1801
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Beesknees999 - CC BY-SA 3.0
Shan, Sa, 1972-
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Gandy, Joseph Michael, 1771-1843
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Plunket, David R. (David Robert), 1838-1919
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Autran, Joseph Antoine, 1813-1877
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Peabody Institute Library (Danvers, MA). - Public Domain
Holten, Samuel, 1738-1816
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Public Domain
Packer, William F. (William Fisher), 1807-1870
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Storer, Anthony Morris, 1746-1799
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Rob McAlear - Public Domain
Priestman, Brian
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Townsend, Solomon, 1746-1811
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Napoleon Sarony - Public Domain
Tesla, Nikola, 1856-1943
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Davis, Ossie
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Brady-Handy Photograph Collection (Library of Congress) - Public Domain
Booker, George William, 1821-1883
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David Shankbone - CC BY-SA 3.0
Musto, Michael, 1955-
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Beresford, John George de la Poer, 1773-1862
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Jones, Absalom, 1746-1818
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I, Sailko - CC BY-SA 3.0
Eardley, Sampson Gideon Eardley, Baron, 1744-1824
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George Dance - Public Domain
Incledon, Charles Benjamin, 1763-1826
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Enright, Richard E.
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Francis, Anne, 1930-2011
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Don Coltman or Steffens Colmer - Public Domain
MacMillan, H. R. (Harvey Reginald), 1885-1976