TY  - RPRT
TI  - A spectrographic method for determining trace amounts of lead in zircon and other minerals
AU  - C. L. Waring
AU  - Helen Worthing
PY  - 1952
DO  - 10.3133/tei216
UR  - https://pubs.usgs.gov/publication/tei216
ID  - tei216
ER  -