{"id":"S2010011829","label":"Permeable reactive barriers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2010011829","normalized_label":"permeable reactive barriers","broader":["http://id.loc.gov/authorities/subjects/sh85083476","http://id.loc.gov/authorities/subjects/sh85145521"],"aliases":["Barrier walls, Permeable reactive","Barriers, Permeable reactive","Barriers, Reactive (Groundwater purification)","Funnel and gate systems (Groundwater purification)","Iron filing walls (Groundwater purification)","PRBs (Permeable reactive barriers)","Passive treatment walls (Groundwater purification)","Permeable reactive barrier walls","Permeable reactive subsurface barriers","Reactive barriers (Groundwater purification)","Subsurface barriers, Permeable reactive"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2010011829","provider":"lcsh","revision":"50753c41b7d6678a","taxonomy_revision":"f050b5d4780b1289","title":"Permeable reactive barriers","url":"/topics/S2010011829","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9821304078637081186","address_version":"morton4x16-v1","coordinates":[0,479,14690,54272],"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}