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Advances in Civil Engineering
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2019
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Article
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Fig 8
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Research Article
Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi
Figure 8
Scanned thin section images. The arrow length is 2 mm. (a) Mchenga arkose sandstone. (b) Mchenga fine-grained sandstone.
(a)
(b)