TY  - RPRT
TI  - Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples distributed in September 2001
AU  - Mark T. Woodworth
AU  - Brooke F. Connor
PY  - 2002
DO  - 10.3133/ofr028
UR  - https://pubs.usgs.gov/publication/ofr028
ID  - ofr028
ER  -