{"id":"S89000811","label":"ELF electromagnetic fields","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh89000811","normalized_label":"elf electromagnetic fields","broader":["http://id.loc.gov/authorities/subjects/sh85042168"],"aliases":["ELF fields","Extremely low frequency electromagnetic fields","Extremely low frequency fields"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh89000811","provider":"lcsh","revision":"ff3c10ea35ba5e61","taxonomy_revision":"f050b5d4780b1289","title":"ELF electromagnetic fields","url":"/topics/S89000811","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9278761034619962886","address_version":"morton4x16-v1","coordinates":[0,21,14381,44032],"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}