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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />i <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />r <br />LIST OF FIGURES <br />Figure 3-1 Location Map <br />Figure 3-2 Stratigraphic Column <br />Figure 4-1 A Typical Six-Entry Main Road <br />Figure 4-2 A Typical Room-and-Pillar Panel <br />Figure 4-3 A Typical Longwall Retreat Panel <br />8 <br />11 <br />20 <br />22 <br />24 <br />