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More than 5000 entries on the history, culture and life of Britain (published in 1993 by Macmillan, now out of print)
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Dan-yr-Ogof
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(40km/25m NE of Swansea) Cave system discovered in 1912, with impressive rock formations. It is believed to be the longest accessible sequence of caves in Britain (about 2.5km/1.5m of them are open to the public).
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