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19. Space and Time	19. Space and Time
Space and Time (21)	Space and Soil (5)
description:	US Geological Survey (USGS) publishes soil chemistry data from Major Land Resource Areas (MLRA) studies. Using linked-data techniques, AFDSI imports USGS soil chemistry data to create a USGS soil chemistry ontology.
complete name:	Soil Chemistry Ontology US DOI US GS