Photograph of Widnes, England in the late 19th century showing the effects of industrial pollution. Unknown author, taken from A History of the Chemical Industry in Widnes, by D. W. F. Hardie, Imperial Chemical Industries Limited, 1950.
Europeans Buying Enslaved Africans, ca. 1790. Engraving by John Raphael Smith from a painting by George Morland (Musee du Chateau des Ducs de Bretagne, Nantes (France) - Courtesy of Colonial Williamsburg Foundation)