{"id":"S89001019","label":"Class field towers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh89001019","normalized_label":"class field towers","broader":["http://id.loc.gov/authorities/subjects/sh85026684"],"aliases":["Class towers","Towers (Class field theory)","Towers of algebras","Towers of class fields","Towers, Class field"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh89001019","provider":"lcsh","revision":"92193605e9f54296","taxonomy_revision":"f050b5d4780b1289","title":"Class field towers","url":"/topics/S89001019","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9855221786923631106","address_version":"morton4x16-v1","coordinates":[0,21,14384,60416],"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}