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"This document was produced under R.& D. Project No. 317 by: Silsoe College ...".
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Welsh region : River Arrow, Dreneuydd/Broadway Reen, Dysynni Low Level Drain : annex of R&D note 456 by J. A. L. Dunderdale. Published by National Rivers Authority in 1996. Publication and catalogue information, links to buy online and reader comments.