TY  - RPRT
TI  - Chemical, spectrographic, and modal analyses of syenitic rocks, thorium veins, and carbonatite in the Powderhorn District, Gunnison County, Colorado
AU  - David Carl Hedlund
AU  - Jerry Chipman Olson
PY  - 1980
DO  - 10.3133/ofr80233
UR  - https://pubs.usgs.gov/publication/ofr80233
ID  - ofr80233
ER  -