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Ground subsidence and structural damage over an abandoned room-and-pillar coal mine at Hegeler, IL
I tiakina i:
| Ētahi atu kaituhi: | |
|---|---|
| Hōputu: | Pukapuka |
| Reo: | Ingarihi |
| I whakaputaina: |
Pgh. [i.e. Pittsburgh] Pa
U.S. Dept. of the Interior, Bureau of Mines
1986
|
| Rangatū: | Information circular
9072 |
| Ngā marau: | |
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