{"id":"S85145509","label":"Water--Softening","description":"Works dealing with the treatment of water used in steam-boilers are entered under the heading [Feed-water purification.]","source_url":"https://id.loc.gov/authorities/subjects/sh85145509","normalized_label":"water--softening","broader":["http://id.loc.gov/authorities/subjects/sh85047645","http://id.loc.gov/authorities/subjects/sh85120151"],"aliases":["Softening of water","Water softening"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85145509","provider":"lcsh","revision":"780c26a2617b4ce3","taxonomy_revision":"f050b5d4780b1289","title":"Water--Softening","url":"/topics/S85145509","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9513937776845145664","address_version":"morton4x16-v1","coordinates":[0,20,19678,37888],"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}