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. Author manuscript; available in PMC: 2020 Apr 27.
Published in final edited form as: Int J Min Sci Technol. 2020;30(1):3–9. doi: 10.1016/j.ijmst.2019.12.005

Fig. 2.

Fig. 2.

Deformed gas well inner casing 4.6 m below the coal seam.