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Once all the engineering, accounting and legal obstacles are cleared away, the land is scoured for possible archaeological remains.
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For 48 hours, until Jessica turned up unharmed at a children's clinic five miles away, they watched as police scoured the park pond to see whether she had drowned, and later turned their attention to the whereabouts of a tattooed man whom witnesses had spotted talking to the girl.
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To keep treasure-hunters away, the find remained a secret for two years while archaeologists scoured the area of the melt-back and analysed the finds.
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