"Sulfur occurrence in coal and its relationship to acid water formation : literature review. "; "McMillan, Barry G."; "Acid mine drainage.", "Sulfur."; "McMillan, Barry G."; "undated"; "Serial issue. Issued as: West Virginia University. Coal Research Bureau. Technical report, no. 110. "; ""; "P3953"; "pec"; "Sulfur.", "Acid mine drainage."; "14256"; .