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Long-term effectiveness of deep mine sealing at Moraine State Park, Butler County, Pa. /
I tiakina i:
| Kaituhi matua: | |
|---|---|
| Ētahi atu kaituhi: | |
| Hōputu: | Pukapuka |
| Reo: | Ingarihi |
| I whakaputaina: |
[Avondale, Md.] :
U.S. Dept. of the Interior, Bureau of Mines,
1983.
|
| Rangatū: | Report of investigations (United States. Bureau of Mines) ;
8767. |
| Ngā marau: | |
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