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- 12:06, 26 February 2025 Gcook talk contribs uploaded File:5 Dominion Observatory vertical heat-flow hole being drilled to a depth of 606 m at the rear of the Geology Building 1964.jpg (Dominion Observatory vertical heat-flow hole being drilled to a depth of 606 m at the rear of the Geology Building in 1964. Photo credit - Department History Wall.)