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Asteroid Discovery Circumstances - http://ssd.jpl.nasa.gov/dc_home.html For each minor planet: Where and when found, and by whom.

Exploring The Planets-Discovery - http://www.nasm.si.edu/ceps/etp/discovery/etpdiscovery.html The five known in antiquity, three more since the telescope, and Ceres.

Is Mars Habitable? - http://www.wku.edu/~smithch/wallace/S730.htm A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"

Neptune and Pluto - http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Neptune_and_Pluto.html Mathematical discovery of planets

Orbits and Gravitation - http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Orbits.html The development of the mathematics of planetary motion.

The Planet Mars: A History of Observation and Discovery - http://www.uapress.arizona.edu/onlinebks/mars/contents.htm On-line version of the book by William Sheehan.

The Struggles to Find the Ninth Planet - http://pagesperso-orange.fr/olivier.granier/meca/vulga/pluton/pluton.htm A paper by Clyde Tombaugh relating his discovery of Pluto.

When Did the asteroids Become Minor Planets? - http://aa.usno.navy.mil/faq/docs/minorplanets.php Discusses the discovery of the first asteroids, their designation as planets, and their reclassification.

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