TY  - RPRT
TI  - Sample preparation and gamma-ray spectrometer operation for determining natural radioelement contents in rocks at the U.S. Geological Survey in Denver, Colorado
AU  - Charles A. Bush
PY  - 1981
DO  - 10.3133/ofr811308
UR  - https://pubs.usgs.gov/publication/ofr811308
ID  - ofr811308
ER  -