{"id":"S2004009547","label":"Liquid propellant rocket engines","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2004009547","normalized_label":"liquid propellant rocket engines","broader":["http://id.loc.gov/authorities/subjects/sh85114703"],"aliases":["Liquid propellant rockets--Engines","Liquid rocket engines"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2004009547","provider":"lcsh","revision":"c900d6e125d5a3cc","taxonomy_revision":"f050b5d4780b1289","title":"Liquid propellant rocket engines","url":"/topics/S2004009547","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4936165395141911046","address_version":"morton4x16-v1","coordinates":[0,477,51977,11264],"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}