1 Subjects: “...coal roadway...”

2 Subjects: “...coal and gas outburst...”

3 Subjects: “...coal-measure logging response...”

4 Subjects: “...coal...”

5 Subjects: “...middle and high rank coal...”

6 Subjects: “...primary coal...”

7 Subjects: “...coal-measure source rock...”

8 Subjects: “...tectonically deformed coal...”

9 Subjects: “...coal-grout structure...”

10 Subjects: “...coal-grout structure...”

11 Subjects: “...coal properties...”

12 Subjects: “...coal miners...”