TY  - RPRT
TI  - Geology and chemical analyses of coal and coal-associated rock samples, Williams Fork Formation (Upper Cretaceous), northwestern Colorado
AU  - R.T. Hildebrand
AU  - R.S. Garrigues
AU  - R. F. Meyer
AU  - M.C. Reheis
PY  - 1981
DO  - 10.3133/ofr811348
UR  - https://pubs.usgs.gov/publication/ofr811348
ID  - ofr811348
ER  -