{"id":"S85120464","label":"Sewage--Purification--Aeration","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85120464","normalized_label":"sewage--purification--aeration","broader":["http://id.loc.gov/authorities/subjects/sh85120499"],"aliases":["Aeration of sewage"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85120464","provider":"lcsh","revision":"2a42e5564c815efb","taxonomy_revision":"f050b5d4780b1289","title":"Sewage--Purification--Aeration","url":"/topics/S85120464","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"864761789324592708","address_version":"morton4x16-v1","coordinates":[0,20,19287,16384],"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}