EarthRef.org Controlled Vocabularies

EarthRef.org Databases
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EarthRef.org Controlled Vocabularies

Category	Value
Class	Not Specified
Class	Archeologic
Class	Extraterrestrial
Class	Extrusive
Class	Igneous
Class	Intrusive
Class	Synthetic
Class	Martian
Class	Metamorphic
Class	Meteorite
Class	Sedimentary
Class	Subaerial
Class	Submarine
Class	Lunar