I want to know the answer to the following question:
When did the Südharzrevier close?
All the background I'm provided with is that "These are the Südharzrevier in the north of the state, between Bischofferode in the west and Roßleben in the east with Sondershausen at its centre, and the Werrarevier on the Hessian border around Vacha and Bad Salzungen in the west.". Is that enough to answer the question?