One of the world’s most productive underground salt mines lies beneath the city of Detroit in the United States. The 240-acre “city beneath a city” has its own transportation system, maintenance shops, telephone, light, and power lines, and a network of main and side streets.
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https://paperspast.natlib.govt.nz/newspapers/BPB19500619.2.35
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Bay of Plenty Beacon, Volume 15, Issue 58, 19 June 1950, Page 7
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45Untitled Bay of Plenty Beacon, Volume 15, Issue 58, 19 June 1950, Page 7
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