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Callisto
http://www.nineplanets.org/callisto.html
Overview, with text, images, and links.
Galileo Project: Images: Callisto
http://galileo.jpl.nasa.gov/gallery/callisto.cfm
Collection of photographs from the NASA Galileo Mission.
Solarviews.com: Callisto
http://www.solarviews.com/eng/callisto.htm
General information, data and pictures.