TY  - RPRT
TI  - A spectrographic method for determining the hafnium-zirconium ratio in zircon
AU  - C. L. Waring
AU  - H.W. Worthing
PY  - 1955
DO  - 10.3133/tei502
UR  - https://pubs.usgs.gov/publication/tei502
ID  - tei502
ER  -