{"id":"S2005002061","label":"Flipper propulsion (Marine engineering)","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2005002061","normalized_label":"flipper propulsion (marine engineering)","broader":["http://id.loc.gov/authorities/subjects/sh85139627"],"aliases":["Boat flippers","Flippers, Boat","Oscillating foil propulsion (Marine engineering)"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2005002061","provider":"lcsh","revision":"b4b6a34d47edfb8e","taxonomy_revision":"f050b5d4780b1289","title":"Flipper propulsion (Marine engineering)","url":"/topics/S2005002061","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"38294093264479780","address_version":"morton4x16-v1","coordinates":[0,478,1949,13312],"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}