TY  - RPRT
TI  - The determination of 30 elements in geological materials by energy-dispersive X-ray fluorescence spectrometry
AU  - D. F. Siems
PY  - 2000
DO  - 10.3133/ofr00475
UR  - https://pubs.usgs.gov/publication/ofr00475
ID  - ofr00475
ER  -