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Mark		Year	Entries
	Planetary rings -- See also the narrower term Saturn (Planet) Ring system		1
	Planetary rings.	c1984	1
	Planetary satellites -- See Satellites		1
	Planetary scientists -- United States.	c2005	1
	Planetary theory -- See also the narrower term Kepler's laws		1
	Planetary theory.		4
	Planetary theory -- Early works to 1800.		2
	Planetary volcanoes -- Guidebooks.	2005	1
	Planetoids -- See Asteroids		1
	Planetology.		7
	Planetology -- Congresses.		2
	Planetology -- United States.	1996	1

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