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Tunnel Portal and Tunnel, Llanllyfni

Tunnel Portal and Tunnel, Llanllyfni
  • 146
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Era Quarry, Ceinws / Esgairgeiliog

Era Quarry, Ceinws / Esgairgeiliog
  • 372
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In the open chamber at Rhiwgreiddyn slate quarry

In the open chamber at Rhiwgreiddyn slate quarry
  • 361
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Experimental round tunnel

Experimental round tunnel
  • 365
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Tunnel at Esgairfoeleirin quarry

Tunnel at Esgairfoeleirin quarry
  • 419
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Entrance to a lower level tunnel at...

Entrance to a lower level tunnel at...
  • 390
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