{"id":"S2003001921","label":"Irrigation engineering, Prehistoric","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2003001921","normalized_label":"irrigation engineering, prehistoric","broader":["http://id.loc.gov/authorities/subjects/sh2002005641"],"aliases":["Prehistoric irrigation engineering"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2003001921","provider":"lcsh","revision":"581aacd18446be99","taxonomy_revision":"f050b5d4780b1289","title":"Irrigation engineering, Prehistoric","url":"/topics/S2003001921","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4611769608725225990","address_version":"morton4x16-v1","coordinates":[0,477,36233,1024],"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}