- Masonrycanalsobeusedwhereseismicconcernsexist,becauselightermaterialsarenowavailablethatareengineeredtobeseismicallysafe.ButtheValleystandsongroundthatisasunstable,seismicallyandmetaphorically,asitwasintheearlierbust.Anotherbubble-thistime,notoftheVa...
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