# Natural gas--Acoustic properties { "id": "S2008004205", "title": "Natural gas--Acoustic properties", "url": "/topics/S2008004205", "kind": "topic-directory", "aeo_cohort": "topic-directory", "provider": "lcsh", "revision": "adb63b832c18111e", "catalogue_revision": "f050b5d4780b1289", "numeric_address": "13892562798594384420", "address_version": "morton4x16-v1", "coordinates": [ 0, 478, 48857, 46080 ], "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/sh2008004205 No owner-reviewed local answer yet.