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This work has been released into the public domain by its author, Berteun. This applies worldwide.
In some countries this may not be legally possible; if so: Berteun grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Picture of a 'boortoren', i.e. drilling derrick, formaly used for salt-making. It can be found near Twekkelo in the Netherlands. Own picture.
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