TY  - RPRT
TI  - Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples distributed in October 1999
AU  - T.W. Farrar
PY  - 2000
DO  - 10.3133/ofr00227
UR  - https://pubs.usgs.gov/publication/ofr00227
ID  - ofr00227
ER  -