✦ LIBER ✦
Systematic extraction of safety pillars in the Upper Silesian coal mining industry. In German : Pyltlarz, T 7F, 10R Gluckauf, V112, N4, 1976, P168–173
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 90 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0148-9062
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