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| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Excavation of Σ section. |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Excavation of Σ section. |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Excavation of Σ section. |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Σ |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Σ |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Σ |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Excavation of Σ section. |
| Excavation of Σ section ... AMS Horizontal (normal) ... 2002 ... Excavation of Σ section. |
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