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Subsidence over four room-and-pillar sections in southwestern Pennsylvania /
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| Main Author: | |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior, Bureau of Mines,
1982.
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| Series: | Report of investigations
8645 |
| Subjects: | |
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