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Astronomy 161: Neptune - - General features and some pictures.

Encarta Encyclopedia: Neptune - - Information on the planet Neptune.

Exploring the Planets: Neptune - - Information and photographs on the moons, atmosphere, and rings of planet Neptun.

Mathematical Discovery of Neptune - - Another interesting history on how planets can be discovered mathematically.

Neptune - - Pictures, statistics, and detailed information on planet Neptune.

Neptune114 - - Its atmosphere, rings, moons, appearance, and links to related sites.

NSSDC Photo Gallery: Neptune - - Select images of the planet, with brief captions.

Views of the Solar System: Neptune - - Views, animations, general information and data of the planet.

Welcome to the Planets: Neptune - - Planetary profile and vital statistics.

Windows to the Universe: Neptune - - Overview of several aspects of the planet. Versions available for beginner, intermediate and advanced level users.