2-3-4 Challenge Book Discussions #1 discussion
The Black Echo
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Jonetta
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Dec 31, 2015 03:40AM

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I can't remember the title of a book I read a year or so ago, about people who lived in defunct underground places of NYC. I know the salt mines exist under Cleveland, but don't know whether those are extensive.
It does make me question how "solid" the ground we walk on actually is :). A question we could ask over every manhole cover in the cities, I suppose.