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2. Imagine, “Description of Source Database”, Project Co-ordinator: AEA Technology Rail BV, Document: IMA07TR-050418-DGME02, 6-2-07
3. NIOSH Health Hazard Evaluation Program Noise Measurement Database: NIOSH Dataset RD-1005-2014-0; https://www.cdc.gov/niosh/data/datasets/rd-1005-2014-0/default.html
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