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| Keywords: Playfair-piechart.jpg Pie chart from Playfair's Statistical Breviary Scanned from the book The Commercial and Political Atlas and Statistical Breviary Cambridge University Press 2005 ISBN 0-521-85554-3 1801 William Playfair 1759 “1823 Public domain author died in 1823 PD-old-100 18th-century diagrams Pie charts William Playfair | ||||
