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https://www.safeworkaustralia.gov.au/system/files/documents/1702/adoptednationalexposurestandardsatmosphericcontaminants_nohsc1003-1995_pdf.pdf
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https://www.safeworkaustralia.gov.au/system/files/documents/1702/guidancenote_interpretationofexposurestandardsforatmosphericcontaminants_3rdedition_nohsc3008-1995_pdf.pdf
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