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British hardened field defences of World War II - Wikipedia
Richard Brine photographs the "pillboxes" left over from the war
Pillbox (military) - Wikipedia
The Pillbox Map
Pillboxes [165 photos] :: Geograph Britain and Ireland
UK World War 2 Pillboxes and Anti-Invasion Defences.
UK WWII Defence Locations - The Pillbox Study Group
eDoB Online Map
Hitler’s threatened British Invasion 1940 - The Pillbox Study Group
Pillbox Study Group | The Pillbox Study Group Website.