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Standard plan: Cahill Expressway Tunnel - Air Supply Ducts - Layout of single & twin 10' ducts,
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Standard plan: Cahill Expressway Tunnel - Air Supply Ducts - Layout of single & twin 10' ducts, (01/07/1960 - 24/08/1960), [A-00535271]. City of Sydney Archives, accessed 15 Jan 2026, https://archives.cityofsydney.nsw.gov.au/nodes/view/1716244