1. The strength and stress-strain characteristics of coal in triaxial compression;Hobbs;J. Geol.,1964
2. Elastic properties of two coals;Ko;Int. J. Rock Mech. Min. Sci & Geomech. Abstr.,1976
3. Strength characteristics of U.S. coals;Atkinson,1977
4. Selected deposits of strippable coal in central Rosebud County, Montana;Kepferle;U.S. Geol. Surv. Bull.,1954
5. Quality and reserves of strippable coal, selected deposits, southeastern Montana;Matson;Montana Bur. Mines Geol. Bull.,1973