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Keywords: Playfair piecharts.jpg en Pie charts from Playfair's Statistical Breviary Scanned from the book The Commercial and Political Atlas and Statistical Breviary Cambridge University Press 2005 William Playfair 1759 “1823 1801 Public domain author died in 1823 Image Playfair-piechart jpg a selection from this chart PD-old-100 18th-century diagrams William Playfair Pie charts History of visualization |