TY  - RPRT
TI  - Results of the U. S. Geological Survey's analytical evaluation program for standard reference samples distributed in April 2001
AU  - M.T. Woodworth
AU  - B.F. Connor
PY  - 2001
DO  - 10.3133/ofr01287
UR  - https://pubs.usgs.gov/publication/ofr01287
ID  - ofr01287
ER  -