{"id":"S85057470","label":"Groundwater tracers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85057470","normalized_label":"groundwater tracers","broader":["http://id.loc.gov/authorities/subjects/sh85063440"],"aliases":["Ground-water tracers","Tracers (Hydrogeology)","Tracers, Groundwater"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85057470","provider":"lcsh","revision":"dd03c19cbcd70c5b","taxonomy_revision":"f050b5d4780b1289","title":"Groundwater tracers","url":"/topics/S85057470","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10126489189806917184","address_version":"morton4x16-v1","coordinates":[0,20,18302,63488],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}