Scientists have now found traces of the , in the covers of more than 200 books from around the world.Old books from the 19th-century featured green covers with , prompting some libraries to remove them from the shelves.Book titles produced in the mid-1800s included 'The Complete Poetical Works of William Cowper, Esq' (1845), 'The Liberty Bell' (1856) and 'A Winter Wreath of Summer Flowers' (1855).
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