{"id":"S85100472","label":"Petrology","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85100472","normalized_label":"petrology","broader":["http://id.loc.gov/authorities/subjects/sh85101560"],"aliases":["Lithology","Petrography"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85100472","provider":"lcsh","revision":"600a1b422c19906f","taxonomy_revision":"f050b5d4780b1289","title":"Petrology","url":"/topics/S85100472","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10124162605951370816","address_version":"morton4x16-v1","coordinates":[0,20,18974,57344],"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}