sentences:  Three mines (St. Lorenzigrube, St. Jakobsgrube, Ludwigsgrube) yielded considerable amounts of coal in the 18th and 19th centuries.In the late 18th and early 19th century, wandering "Musikanten" set out from Adenbach, among other places in the region, and travelled to many parts of the world.After the Reformation, the Dukes of Zweibrücken strove to promote schooling in the duchy, their first and foremost goal being to give their subjects the ability to grapple with the Bible by themselves.