P1042 Includes bibliographical references (pages 33-35).
P1073 Testun yn Saesneg gyda chrynodeb gweithredol dwyieithog yn Gymraeg a Saesneg = English text with a bilingual Welsh and English executive summary.
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Afon Tywi SAC shad egg survey 2012 by H. Garrett. Published by Countryside Council for Wales in 2013. Publication and catalogue information, links to buy online and reader comments.