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"For the full details of the research covered by this information note see Natural England Research Report NERR016 - A review of the Environmental Capital Approach in the New Approach to Transport Appraisal"--Page 3.
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A review of the Environmental Capital Approach in the New Approach to Transport Appraisal by Natural England. Published by Natural England in 2008. Publication and catalogue information, links to buy online and reader comments.