Gas Check (09A13)
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Images
References
Pye A. & Woodward F., 1996, The Historic Defences of Plymouth, Exeter Archaeology, ISBN 1 898166 46 3
Woodward F., 1997, Forts or Follies? - A History of Plymouth's Palmerston Forts, Halsgrove, ISBN 1 874448 12 4