A Country's Extent as the Area of a Circle, the Weight of Its Tax as the Direction of a Dotted Line: Playfair's The Statistical Breviary, Chart 1
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3 pages
William Playfair
Dividing the Size of the United States with One Circle: Playfair's 1805 "Divided Circle"
The Same Square Miles, Drawn as the Area of a Circle and as the Angle of a Sector: Playfair in 1801 and 1805
