Mining conditions under the city of Scranton, Pa. : report and maps
William Griffith (Author), Eli T. Conner (Author), J. A. Holmes, Nelson Horatio Darton, United States Bureau of Mines (Issuing body)
Gives results of an investigation undertaken to determine the probable danger from subsidence of the surface through the removal of coal from the various beds underlying the city. Shows by large-scale maps the extent of the workings in each bed. Discusses various methods for supporting the roof and commends the flushing of sand or other material from the surface
Print Book, English, 1912
G.P.O., Washington, 1912