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British Geological Survey<br />
Kingsley Dunham Centre<br />
Keyworth<br />
Nottinghamshire<br />
NG12 5GG<br />
44 (0) 115 936 3100<br />
44 (0) 115 936 3200<br />
dco@bgs.ac.uk<br />
www.bgs.ac.uk<br />
Mr. D. C. Ovadia<br />
British Geological Survey !"#$<br />
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Parkwood Boiler Works<br />
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34