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Pillbox (military) - Wikipedia
Pillboxes and Bunkers of Europe in WWII - Business Insider
British hardened field defences of World War II - Wikipedia
Richard Brine photographs the "pillboxes" left over from the war
The Pillboxes of Camp White 03-Jan-2019 - VanMarmot's Travels
Types Of Pillbox | The Pillbox Study Group Website.
Pillboxes [165 photos] :: Geograph Britain and Ireland
BBC Inside Out - Pill boxes
UK WWII Defence Locations - The Pillbox Study Group
Pillbox Study Group | The Pillbox Study Group Website.