Friability, slacking characteristics, and low-temperature carbonization assays of subbituminous coals of the Denver (Colo.) region - Parry, V. F.; Goodman, John B.; United States. (U.S. Dept. of the Interior, Bureau of Mines, 1939)
Appendix supplies information on mines from which samples were taken.
Keywords: Coal / Colorado / Denver.; Coal / Analysis. / http://id.loc.gov/authorities/subjects/sh85027308