TY  - RPRT
TI  - Abundance and distribution of thorium in the carbonatite stock at Iron Hill, Powderhorn District, Gunnison County, Colorado
AU  - Theodore J. Armbrustmacher
PY  - 1979
DO  - 10.3133/ofr79536
UR  - https://pubs.usgs.gov/publication/ofr79536
ID  - ofr79536
ER  -