"Life-style of the coal miner : America's first hard hat."; "Ross, M. H."; "Coal miners--United States.", "Coal mines and mining--United States."; "Ross, M. H."; "undated"; "Journal article reprint from: Annals of the New York Academy of Sciences, v.200, and: Appalachia Medicine, 1971:Mar., and: Humanizing the Workplace, Roy P. Fairfield, ed. (Buffalo : Prometheus Books). "; ""; "P491"; "pec"; "Coal miners--United States.", "Coal mines and mining--United States."; "14256"; .