{"id":"S2003011490","label":"Atomic hydrogen masers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2003011490","normalized_label":"atomic hydrogen masers","broader":["http://id.loc.gov/authorities/subjects/sh2003011485"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2003011490","provider":"lcsh","revision":"136ba468bf8a1449","taxonomy_revision":"f050b5d4780b1289","title":"Atomic hydrogen masers","url":"/topics/S2003011490","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"13835273843599894082","address_version":"morton4x16-v1","coordinates":[0,477,36382,34816],"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}