1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, China.
2. The Third Exploration Team of Shandong Coalfield Geologic Bureau, Taian, China.
3. The Fifth Prospecting Team of Shandong Coal Geology Bureau, Jinan, China.
4. The Second Prospecting Team of Shandong Coal Geology Bureau, Jining, China.