Longwall gob degasification with surface ventilation boreholes above the Lower Kittanning coalbed
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| Description | report of investigations published in 1976 |
| Author/s |
author: Fred N. Kissell |
| Publication date | January 1, 1976 |
| Language | English |
| Country of origin | |
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| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |