sentences:  Lackawanna County, including Scranton, is part of the Northern Field of the coal region of Pennsylvania and many Europeans immigrated to the area to work in the mines.The mine was closed in 1966 and lay abandoned until 1978 when the mine was converted to a museum, supported by $2.5 million in federal money.Restoration included removal of debris, laying track for a mine car to carry visitors into the mine, installation of electricity for lights, and reinforcing of the shafts with steel buttresses.