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Gazetteer of Planetary Nomenclature
"This gazetteer contains detailed information about all names of topographic and albedo features on planets and satellites (and some planetary ring and ring-gap systems) that the International Astronomical Union (IAU) has named and approved from its founding in 1919 through the present time." From the U.S. Geological Survey.
http://planetarynames.wr.usgs.gov/

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