Dr McConway, of the Open University, studied the original survey data Unicef used to compile its report.

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The original survey was all a hoax.

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The Forestry Commission will survey an extended area around the original infested site in March and tree spraying will begin in April.

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The report found that the original work of the Environment Agency's second survey of historic buildings, up to 2007, represented a "Rolls Royce" approach, which "contributed to the survey falling significantly behind schedule".

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And there must be at least 100 responses for each of the four (the survey is based on responses from more than 43, 700 original owners of 2008 model-year vehicles after three years of ownership).

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Ordnance Survey and English Heritage experts have spent the past few months identifying the original outline.

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But by accounting for further development, continual technology advances such as horizontal drilling and supportive prices, the U.S. Geological Survey calculates that 86% of total U.S. proven reserves are additions to original numbers.

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