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Geofluids
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2019
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Article
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Fig 1
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Research Article
Experimental Investigation of Water-Inrush Risk Based on Permeability Evolution in Coal Mine and Backfill Prevention Discussion
Figure 1
Microstructures of sandstones obtained by SEM. (a) 260x; (b) 1400x; (c) 2400x.
(a)
(b)
(c)