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unknown - Public Domain
w - Public Domain
Albert Shaw - Public Domain
original uploader - Public Domain
Alan Light - CC BY 2.0
Thierry Caro - CC BY-SA 3.0
Shaggy359 - CC BY-SA 2.0
Giovanni Boldini - Public Domain
Carlo Dolci - Public Domain
Artist : Willy Bosschem; photo by Georges Jansoone (JoJan - CC BY-SA 3.0
Environmental Protection Agency of U.S. - Public Domain
Pohearn - CC BY-SA 3.0
Environmental Protection Agency - Public Domain
Editor: Jaci Cutler - Public Domain
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Pingoud, Ernest
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Mauduit-Larive, Jean- Marie, 1747-1827
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Ristow, Walter W. (Walter William), 1908-2006
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unknown - Public Domain
Compans, Jean-Dominique, 1769-1845
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w - Public Domain
Ramirez, Richard Muñoz, 1960-2013
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Albert Shaw - Public Domain
Bryce, Lloyd Stephens, 1851-1917
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Marclay, Christian, 1955-
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original uploader - Public Domain
Clarke, John L. (John Louis), 1881-1970
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Alan Light - CC BY 2.0
Deforest, Calvert
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Thierry Caro - CC BY-SA 3.0
Leterrier, Louis, 1973-
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Dixon, Dean, 1915-1976
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Shaggy359 - CC BY-SA 2.0
Edmondson, Adrian, 1957-...
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Phot Sārasin, 1906-2000
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Page, Walter Hines, 1855-1918
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Giovanni Boldini - Public Domain
Brown, John-Lewis 1829-1890
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Starhemberg, Ernst Rüdiger, Fürst von, 1899-1956
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Carlo Dolci - Public Domain
Dolci, Carlo, 1616-1686
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Brooks, Bryant B. (Bryant Butler), 1861-1944
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De Chair, Dudley Rawson Stratford, Sir, 1864-
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unknown - Public Domain
Sellery, George C. (George Clarke), 1872-
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Artist : Willy Bosschem; photo by Georges Jansoone (JoJan - CC BY-SA 3.0
Bekaert, Piet, 1939-
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Ardon, Mordecai͏̈, 1896-
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Duisberg, Carl, 1861-1935
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Harris, George E. (George Emrick), 1827-1911
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Environmental Protection Agency of U.S. - Public Domain
Burford, Anne M. (Anne McGill), 1942-
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Pohearn - CC BY-SA 3.0
Ohearn, Patrick
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Environmental Protection Agency - Public Domain
Costle, Douglas M. (Douglas Michael), 1939-2019
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Editor: Jaci Cutler - Public Domain
Hunter, Howard W., 1907-1995
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unknown - Public Domain
Spinelli, Altiero
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original uploader - Public Domain
Romberg, Moritz Heinrich, 1795-1873