1 Subjects: “...Rhenish coal-mining area...”

2 Subjects: “...mining environmental liabilities...”

3 Subjects: “...mines...”

4 Subjects: “...gold mining area...”

5 Subjects: “...process mining...”

6 Subjects: “...data mining...”

7 Subjects: “...Ni mining...”

8 Subjects: “...high temperature on corrosion of mining pipes...”

9 Subjects: “...phosphate mines...”

10 Subjects: “...data mining...”

11 Subjects: “...mining...”