The Sand and Gravel Resources of the Country South of Wrexham, Clwyd: Description of 1:25 000 Sheet SJ 34 and Parts of SJ 24 (Mineral Assessment Reports)
British Geological Survey · 1982
Ppb.
details (UK).
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details (Canada).
details (Germany).
details (France).
ISBN: 978-0-11-884306-5
ISBN-10: 0-11-884306-0