# Nickel sulfate { "id": "S2007003319", "title": "Nickel sulfate", "url": "/topics/S2007003319", "kind": "topic-directory", "aeo_cohort": "topic-directory", "provider": "lcsh", "revision": "af2a2da6bf5b3c1a", "catalogue_revision": "f050b5d4780b1289", "numeric_address": "14413920168461869664", "address_version": "morton4x16-v1", "coordinates": [ 0, 478, 33218, 56320 ], "answer_status": "Directory metadata; local answer requires separate source review", "truth_status": "Subject descriptor, not a factual answer or a demonstrated knowledge gap" } Directory metadata is not a factual answer or evidence of a global knowledge gap. Source: https://id.loc.gov/authorities/subjects/sh2007003319 No owner-reviewed local answer yet.