Geologic factors in predicting coal mine roof-rock stability in the Upper Kittanning coalbed. Somerset County, Pennsylvania
| Image |  |
|---|---|
| Description | report of investigations published in 1981 |
| Author/s |
author: Anthony T. Iannacchione |
| Publication date | January 1, 1981 |
| Language | English |
| Country of origin | |
| Wikipedia link | |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |