title: Coal-mining officials plead guilty.
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis; D003032:Coal Mining / Q000331:legislation & jurisprudence*; D004781:Environmental Exposure / Q000331:legislation & jurisprudence; D005607:Fraud; D014481:United States
chemical_list: D000395:Air Pollutants, Occupational