A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams

<div>Distribution law of the particle sizes of the hard coal in the different coal seams. (a) Hard coal of the No. 4 coal seam. (b) Hard coal of the No. 13 coal seam.</div>

Advances in Civil Engineering

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Figure 2

Figure 2: A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams 