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Neptune and Pluto
Mathematical discovery of planets
Is Mars Habitable?
A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"
Orbits and Gravitation
The development of the mathematics of planetary motion.
Notes on Sunspot Observations
John Winthrop's 1739 notes, from the collected papers of Fredrick Kilgour.
Exploring The Planets-Discovery
The five known in antiquity, three more since the telescope, and Ceres.
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