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James Lorenzo Bowen (1842-1919) - Public Domain
E. Spencer Macky - Public Domain
Charles Deforest Fredricks - Public Domain
rchapin - CC BY-SA 2.0
:d:Q3307830 - Public Domain
original photographer unknown, retouched by Tim Ross - Public Domain
Marek Ślusarczyk (Tupungato - CC BY 3.0
SpeedyGonsales - CC BY-SA 3.0
Sumori - CC BY-SA 3.0
The Wilderness Society -
unknown - Public Domain
:en:Carl Van Vechten - Public Domain
unknown photographer - Public Domain
AllieBammie - CC BY-SA 4.0
Foto Team - Public Domain
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Hawley, Joseph Henry, Sir, 1813-1875
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James Lorenzo Bowen (1842-1919) - Public Domain
Wild, Edward Augustus, 1825-1891
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Johnston, Harriet Lane, 1830-1903
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E. Spencer Macky - Public Domain
David, T. W. Edgeworth (Tannatt William Edgeworth), 1858-1934
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Charles Deforest Fredricks - Public Domain
Dilger, Hubert Anton Casimir, 1836-1911
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rchapin - CC BY-SA 2.0
Chapin, Robert
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:d:Q3307830 - Public Domain
Agardh, C. A. (Carl Adolf), 1785-1859
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original photographer unknown, retouched by Tim Ross - Public Domain
Loomis, Mahlon, 1826-1886
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King, Philip Parker, 1793-1856
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Marek Ślusarczyk (Tupungato - CC BY 3.0
Mover, Bob
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SpeedyGonsales - CC BY-SA 3.0
Murtić, Edo
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Savonarola, Girolamo, 1452-1498
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Cash, William
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Preston, Kelly
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Lucas, Robert, 1781-1853
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Sumori - CC BY-SA 3.0
Eaglin, Snooks, 1936-2009
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Beaumont, George Howland, Sir, 1753-1827
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The Wilderness Society -
Frank, Bernard, 1902-1964
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unknown - Public Domain
Clifford, Kathleen, 1887-1962
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unknown - Public Domain
Judson, Phoebe Goodell, 1832-1926
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:en:Carl Van Vechten - Public Domain
Primus, Pearl
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Holt, Kimberly Willis
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unknown photographer - Public Domain
Clark, William Andrews, Jr.
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AllieBammie - CC BY-SA 4.0
Davis, Jill A., 1966-
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Macedo, José Agostinho de, 1761-1831
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Stölzl, Gunta, 1897-1983
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Foto Team - Public Domain
André, Carole 1953-...
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unknown - Public Domain
Tarr, Ralph S. (Ralph Stockman), 1864-1912
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unknown - Public Domain
Ponsonby-Fane, Spencer Cecil Brabazon, 1824-1915
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Euler, Johann Albrecht, 1734-1800