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Standard plan: Cahill Expressway Tunnel - Air Supply Ducts - Layout of twin 8'6" ducts, 19DB & 20DB
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Standard plan: Cahill Expressway Tunnel - Air Supply Ducts - Layout of twin 8'6" ducts, 19DB & 20DB (01/03/1960 - 23/05/1960), [A-00535259]. City of Sydney Archives, accessed 20 Jul 2026, https://archives.cityofsydney.nsw.gov.au/nodes/view/1716232