Hello John,
nice to read, that an other experienced member has joined the list.
Welcome!
John Dale wrote:
> give me, especially with relation to underground clay mines.
In this context an underground clay mine near Neuwied in Germany
comes to my mind.
It has been in operation until approx. 1990.
I don't have detailed data about it, but I could provide
photographs.
Greetings
Harald
--
Harald Finster
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Windoze can be used on the North-Pole without any problems,
... because a frozen computer can't freeze
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