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Lai Afong - Public Domain
Fitz Gitler - CC BY 2.0
Heinrich Klaffs - CC BY-SA 2.0
Erling Mandelmann - CC BY-SA 3.0
unknown - Public Domain
David K Yeates & Peter S Cranston - CC BY 3.0
Public Domain
Philip Haas - Public Domain
Alan Light - CC BY 2.0
BiblioArchives / LibraryArchives - CC BY 2.0
Ron Baker (https://www.flickr.com/photos/kingsnake) - CC BY-SA 3.0
Lorens Pasch the Elder - Public Domain
James Godby after J. Hunter - Public Domain
scillystuff -
MOSSOT - CC BY-SA 3.0
Presidential Press and Information Office -
M.O. Hammond - Public Domain
ABC Television - Public Domain
NASA - Public Domain
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Lai Afong - Public Domain
Hirth, Friedrich, 1845-1927
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Murray, Archibald
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Fitz Gitler - CC BY 2.0
Jenkins, John, 1931-
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Heinrich Klaffs - CC BY-SA 2.0
Finn, Fred E. 1947-2003
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Erling Mandelmann - CC BY-SA 3.0
Haubensak, Pierre, 1935-
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unknown - Public Domain
Paish, George, 1867-1957
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David K Yeates & Peter S Cranston - CC BY 3.0
Colless, D. H.
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Curran, Joseph Edwin, 1906-1981
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Public Domain
Woodsworth, J. S. (James Shaver), 1874-1942
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Babcock, S. M.
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Philip Haas - Public Domain
Graves, W. J. (William Jordan), 1805-1848
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Alan Light - CC BY 2.0
Deforest, Calvert
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BiblioArchives / LibraryArchives - CC BY 2.0
Franca, Celia, 1921?-2007
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Ron Baker (https://www.flickr.com/photos/kingsnake) - CC BY-SA 3.0
Wonderland, Carolyn
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Hoppe, Marianne, 1909-2002
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Crutzen, Paul J., 1933-....
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Niox, G. (Gustave), 1840-1921
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Lorens Pasch the Elder - Public Domain
Gyllenborg, Carl, greve, 1679-1746
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James Godby after J. Hunter - Public Domain
Fawcett, John, 1740-1817
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Juxon, William, 1582-1663
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Avalon, Frankie
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scillystuff -
Benjamin, Leanne, 1964-
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MOSSOT - CC BY-SA 3.0
Brusset, Jean-Paul 1909-1985
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Presidential Press and Information Office -
Tulikov, Serafim
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Barlow, Peter, 1776-1862
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M.O. Hammond - Public Domain
Watson, Homer, 1855-1936
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ABC Television - Public Domain
Rodriguez, Percy
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NASA - Public Domain
Schweickart, Rusty, 1935-
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Vance, Robert B. (Robert Brank), 1828-1899
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unknown - Public Domain
Harris, T. M. (Thomas Mealey), 1817-1906