{"id":"S2003011485","label":"Hydrogen masers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2003011485","normalized_label":"hydrogen masers","broader":["http://id.loc.gov/authorities/subjects/sh85081801"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2003011485","provider":"lcsh","revision":"1411f78882774932","taxonomy_revision":"f050b5d4780b1289","title":"Hydrogen masers","url":"/topics/S2003011485","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"5226511214485857858","address_version":"morton4x16-v1","coordinates":[0,477,36382,29696],"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}