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unknown - Public Domain
Mathew Brady - Public Domain
Tsui - CC BY-SA 4.0
Tom Beetz - CC BY 2.0
uk - CC BY-SA 3.0
Uyvsdi - Public Domain
Tusco - CC BY-SA 4.0
BatteryIncluded - CC BY-SA 3.0
DarralynnHutson - CC BY-SA 4.0
CBS Television. It was not uncommon for television networks, studios and sponsors of television programs to use either a public relations firm or advertising agency for distribution of publicity material. This was distributed by the Bureau of Industrial Service, which was a division of advertising agency Young & Rubicam. - Public Domain
William Patten Junior - Public Domain
Fernand Desmoulins - Public Domain
Public Domain
Hecht, Gerald V. (National Institutes of Health). - Public Domain
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Habermann, Johann, 1516-1590
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Hall, Joshua G. (Joshua Gilman), 1828-1898
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original uploader - Public Domain
Gagern, Max
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unknown - Public Domain
Poulsen, Johannes, 1881-1938
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Weddell, James, 1787-1834
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Ax, Emanuel
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Spix, Johann Baptist von 1781-1826
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Baker, Kenny, 1912-1985
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Mathew Brady - Public Domain
Crawford, Jr., Samuel Wylie, 1829-1892
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Tsui - CC BY-SA 4.0
Beckermann, Ruth, 1952-....
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Agassiz, Alexander, 1835-1910
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Tom Beetz - CC BY 2.0
Wright, Lizz
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uk - CC BY-SA 3.0
Hunczak, Taras, 1932-
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Von Mises, Richard, 1883-1953
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Willson, Edward James, 1787-1854
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Uyvsdi - Public Domain
Hinton, Leanne.
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Tempest, Marie, 1866-1942
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Imamura, Hitoshi, 1886-1968
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unknown - Public Domain
Levy, Amy, 1861-1889
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Tusco - CC BY-SA 4.0
Broué, Pierre
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unknown - Public Domain
Procter, John Robert, 1844-1903
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BatteryIncluded - CC BY-SA 3.0
Ryan, Tubal Claude, 1898-1982
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DarralynnHutson - CC BY-SA 4.0
Brown, Camille A.
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CBS Television. It was not uncommon for television networks, studios and sponsors of television programs to use either a public relations firm or advertising agency for distribution of publicity material. This was distributed by the Bureau of Industrial Service, which was a division of advertising agency Young & Rubicam. - Public Domain
Addams, Dawn, 1930-1985
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Riou, Edward, 1762-
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William Patten Junior - Public Domain
Banks, Edward, 1769?-1835
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Herglotz, Gustav, 1881-1953
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Fernand Desmoulins - Public Domain
Grasset, Eugène 1845-1917
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Public Domain
Scanderbeg, 1405?-1468
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Hecht, Gerald V. (National Institutes of Health). - Public Domain
Nirenberg, Marshall W., 1927-2010