Hopkins, Thomas C.2015-08-192015-08-19http://hdl.handle.net/11603/157This resource was created circa 1965-1969.3 volumesen-USThis resource may be copyright protected. You may make use of this resource, with proper attribution, for educational and other non-commercial uses only. Contact the contributing organization to obtain permission for reproduction, publication, and commercial use.Acid mine drainage -- MarylandMine drainageWater -- Pollution -- MarylandText