✦ LIBER ✦
Longwall faces worked either to the dip or to the rise. Methods used in the Ostrava-Karvina coal-fields : Dlouhy, J In Czech. VV UU Zprava, N17, 1973, P1–124.
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 113 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0148-9062
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