P1073 Testun Saesneg, gyda chrynodeb Cymraeg/Saesneg = English text, with Welsh/English summary.
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Afon Tywi population attribute condition assessment for brook, river and sea lamprey 2011 by R. Thomas. Published by Cyngor Cefn Gwlad Cymru in 2012. Publication and catalogue information, links to buy online and reader comments.