{"id":"S85110952","label":"Railroads--Economics of construction","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85110952","normalized_label":"railroads--economics of construction","broader":[],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85110952","provider":"lcsh","revision":"be32f0adcb50fd1f","taxonomy_revision":"f050b5d4780b1289","title":"Railroads--Economics of construction","url":"/topics/S85110952","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9547701854788518464","address_version":"morton4x16-v1","coordinates":[0,20,19138,40960],"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}