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The ecology and conservation of Llyn Idwal and Llyn Cwellyn..:

Duigan, C.A. ; Allott, T.E.H. ; Monteith, D.T....
Aquatic Conservation: Marine and Freshwater Ecosystems.  8 (1998)  3 - p. 325-360 , 1998
Link: https://doi.org/10.1002/(sici)1099-0755(199805/06)8:3<..