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Herschel, W., 1784. On the Remarkable Appearances at the Polar Regions of the Planet Mars, the Inclination of Its Axis, the Position of Its Poles, and Its Spheroidical Figure; With a Few Hints Relating to Its Real Diameter and Atmosphere. Philosophical Transactions of the Royal Society of London, v. 74, pp. 233-273. They liked long titles in those days. The paper includes these drawings among others, made starting in 1777. #maps #mars