 Some limited form of forest management begun in the 18th century while in the industrial age demand for firewood was sustained by metallurgic industries in the settlements and cities around the mountains.In the 19th century the Central Sudetes had an economic boom with sandstone quarrying and a flourishing tourism industry centered on the natural scenery.Despite of this there was at least since the 1880s a trend of depopulation of villages and hamlets which continued into the 20th century.