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10 Acknowledgements
First I want to thank Ankerpoort B.V. for access
in their Curfs quarry in Berg en Terblijt and ENCI Nederland B.V.
for access in their quarry in Maastricht. I also want to thank Mr.
Felder and Mr. Dortangs for accompanying me in the Curfs quarry
and Dr. J. Smit (Free University Amsterdam) for his advise.
© 1999
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