TY  - RPRT
TI  - Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples distributed in September 2002
AU  - Mark T. Woodworth
AU  - Brooke F. Connor
PY  - 2003
DO  - 10.3133/ofr02481
UR  - https://pubs.usgs.gov/publication/ofr02481
ID  - ofr02481
ER  -