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BTgovernment agencies
 .survey organizations
NTBritish Geological Survey
 ENADIMSA
 Geological Survey of Canada
 Geological Survey of India
 Illinois State Geological Survey
 Ontario Geological Survey
 U. S. Geological Survey
UFgeologic surveys
RTassociations
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SNUsed for the work of geological surveys, national or local. Before 1981, search specific name of the survey organization. Indexed with name of survey organization in original language. Added to Thesaurus in 1981.