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Data sets Publications Expeditions Thesaurus
surficial geology  search
 landform description
 shallow aquifers
 shallow depth
 surface textures
 surficial geology maps
SNSee surficial geology maps.
Surficial Geology (category)  search
SNSurficial geology, GeoRef category codes 23-25, are a group of the 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 L
surficial geology maps  search
 .surficial geology maps
 geomorphologic maps
 surficial geology
SNBefore 1983, also search maps AND surficial geology. Before 1978, also search maps AND (surficial OR (surface AND geologic)). Added to Thesaurus in 1983.