# Radioisotopes in hydraulic engineering { "id": "S85110738", "title": "Radioisotopes in hydraulic engineering", "url": "/topics/S85110738", "kind": "topic-directory", "aeo_cohort": "topic-directory", "provider": "lcsh", "revision": "d3e2a0a1b1eb92f0", "catalogue_revision": "f050b5d4780b1289", "numeric_address": "864902510643922500", "address_version": "morton4x16-v1", "coordinates": [ 0, 20, 19135, 18432 ], "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/sh85110738 No owner-reviewed local answer yet.