{"id":"S99014724","label":"Railroad tunnels--Massachusetts","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh99014724","normalized_label":"railroad tunnels--massachusetts","broader":[],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh99014724","provider":"lcsh","revision":"dd680002b19a66fa","taxonomy_revision":"f050b5d4780b1289","title":"Railroad tunnels--Massachusetts","url":"/topics/S99014724","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4615134379021304358","address_version":"morton4x16-v1","coordinates":[0,23,39777,4096],"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}