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  Peak District National Park: Carl Wark - YouTube

  https://www.youtube.com/watch?v=Ekwuy2Cp-Ys

  I check out Carl Wark an ancient hill fort in the Peak District. Potentially 2500 years old and later refortified by Romans, Carl Wark overlooks Burbage Vall...

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  Cadbury Castle, Somerset: the early medieval archaeology - Leslie Alcock, Sylvia J. Stevenson, Chris Musson - Google Books

  https://books.google.de/books?hl=de&id=h4pnAAAAMAAJ&dq=flatfish+chamfered

  Cadbury Castle, Somerset, is an impressively large hillfort, originally built in the Celtic Iron Age and briefly overrun by the Roman army in the first century AD. It has the longest record of occupation of any hillfort in Britain, for its defences were…

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