Another interesting history on how planets can be discovered mathematically.
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Neptune_and_Pluto.html
Concise introduction to this cold and distant planet, with numerous resources including animations and vital statistics.
http://www.harmsy.freeuk.com/neptune.html
Overview of several aspects of the planet. Versions available for beginner, intermediate and advanced level users.
http://www.windows.ucar.edu/tour/link=/neptune/neptune.html
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