Image from Wikimedia Commons
Dukeofsully3 - CC BY-SA 4.0
Terryjoanmarks - CC BY-SA 3.0
Artist: Samuel Johnson Woolf (1880-1948). Time magazine. - Public Domain
Arthur Szyk - CC BY-SA 4.0
El bes - CC BY-SA 3.0
Percival (first name unknown) - Public Domain
The Notman Photographic Co., Boston - Public Domain
unknown - Public Domain
Sulfur -
C.M. Bell - Public Domain
Unknown photographer (not specified in book) -
Bridget Laudien - CC BY-SA 3.0
w:Bassano and Vandyk - Public Domain
David Shankbone - CC BY-SA 3.0
Public Domain
Author - Peter Pelham, sold by Edward Cooper, after Thomas Gibson -
Gardner Campbell - CC BY-SA 2.0
Image from Wikimedia Commons
Dukeofsully3 - CC BY-SA 4.0
Goddard, John, 1926-
Image from Wikimedia Commons
Yorke, Charles Philip, 1764-1834
Image from Wikimedia Commons
Terryjoanmarks - CC BY-SA 3.0
Wolins, Joseph
Image from Wikimedia Commons
Artist: Samuel Johnson Woolf (1880-1948). Time magazine. - Public Domain
Coffin, Henry Sloane, 1877-1954
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Talbot, Isham, 1773-1837
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Bailey, Theodorus, 1805-1877
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Mooney, James, 1861-1921
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Arthur Szyk - CC BY-SA 4.0
Szyk, Arthur, 1894-1951
Image from Wikimedia Commons
El bes - CC BY-SA 3.0
Fishman, Joshua A.
Image from Wikimedia Commons
Percival (first name unknown) - Public Domain
Percival, James Gates, 1795-1856
Image from Wikimedia Commons
The Notman Photographic Co., Boston - Public Domain
Towle, George M. (George Makepeace), 1841-1893
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unknown - Public Domain
Zeder, Fred, 1886-
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Sulfur -
Juneau, Solomon Laurent, 1793-1856
Image from Wikimedia Commons
C.M. Bell - Public Domain
Stevenson, Matilda Coxe, 1850-1915
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Unknown photographer (not specified in book) -
Schiøtz, Hjalmar, 1850-1927
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Alten, M. (Mathias), 1871-1938
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Bridget Laudien - CC BY-SA 3.0
Platt, Oliver
Image from Wikimedia Commons
w:Bassano and Vandyk - Public Domain
Gates, R. Ruggles (Reginald Ruggles), 1882-1962
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Mehnert, Klaus, 1906-1984
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unknown - Public Domain
Lang, Andrew, 1844-1912
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unknown - Public Domain
Flagler, Henry Morrison, 1830-1913
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David Shankbone - CC BY-SA 3.0
Stipe, Michael, 1960-
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Bennett, Robert F. (Robert Frederick), 1927-2000
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Public Domain
Leffingwell, Albert, 1845-1916
Image from Wikimedia Commons
Author - Peter Pelham, sold by Edward Cooper, after Thomas Gibson -
Molesworth, Robert Molesworth, Viscount, 1656-1725
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Gardner Campbell - CC BY-SA 2.0
Taylor, Robert, 1932-2008
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Thaw, William, 1818-1889
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Valla, Lorenzo, 1407-1457
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Hellens, Franz
Image from Wikimedia Commons
Chamberlin, Judi, 1944-2010