✦ LIBER ✦
Research on downward crack closing of clay aquiclude in shallow coal seam safety mining
✍ Scribed by Qing-xiang Huang; Wen-zhong Zhang
- Book ID
- 107653452
- Publisher
- China Coal Society
- Year
- 2011
- Tongue
- English
- Weight
- 600 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1006-9097
No coin nor oath required. For personal study only.