TY  - RPRT
TI  - Present investigations of radioactive raw materials by the Geological Survey and a recommended program for future work
AU  - A.P. Butler
AU  - F.W. Stead
PY  - 1947
DO  - 10.3133/tei36
UR  - https://pubs.usgs.gov/publication/tei36
ID  - tei36
ER  -