1. The four hour day in coal;Archbald,1922
2. The union and the coal industry;Baratz,1955
3. Comparative efficiency of labor in the bituminous coal industry under union and nonunion operation;Bituminous Operators' Special Committee;Submitted to the United States Coal Commission,1923
4. Labor agreements in coal mines: A case study of the administration of agreements between miners' and operators' organizations in the bituminous coal mines of Illinois;Bloch,1931
5. The unionization of West Virginia coal, 1900–1935: A chrnology;Boal,1992