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extraterrestrial geology  search
RTApollo Program
 Apollo-Soyuz Program
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 cosmic rays
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SNBroad topic used for studies about materials and processes outside the Earth, and for the discipline as a whole. For solar system or discussions of more than one planet, use planetology.
Extraterrestrial Geology (category)  search
SNExtraterrestrial geology, GeoRef category code 04, is one of thirty categories used to classify documents in GeoRef. Each reference in GeoRef is assigned one or more categories. Categories can be used, in addition to Terms, to refine searches (See List A.