{"id":"S2007001671","label":"Ballast water--Purification","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2007001671","normalized_label":"ballast water--purification","broader":[],"aliases":["Ballast water purification","Ballast water treatment","Purification of ballast water","Treatment of ballast water"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2007001671","provider":"lcsh","revision":"0ec0fd6c93b59cd7","taxonomy_revision":"f050b5d4780b1289","title":"Ballast water--Purification","url":"/topics/S2007001671","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4614087379240772132","address_version":"morton4x16-v1","coordinates":[0,478,33193,7168],"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}