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08-26-2015, 05:48 PM
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Sage
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Join Date: Jun 2008
Posts: 3,267
Thanks: 3
Thanked 14 Times in 11 Posts
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Sinkhole
This may be of help. What is the difference between "Sinkhole" and "Catastrophic Ground Collapse"
The difference between sinkhole activity and catastrophic ground collapse
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