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Today - Blue John 'discovered after 68 years' - 大象传媒 Sounds

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Blue John 'discovered after 68 years'Blue John 'discovered after 68 years'

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Mr Harrison explains how a seam of Blue John stone was found after 68 years of looking.

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Blue John 'discovered after 68 years'
Mr Harrison explains how a seam of Blue John stone was found after 68 years of looking.
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