TY  - RPRT
TI  - USGS Blind Sample Project: monitoring and evaluating laboratory analytical quality
AU  - Amy S. Ludtke
AU  - Mark T. Woodworth
PY  - 1997
DO  - 10.3133/fs13697
UR  - https://pubs.usgs.gov/publication/fs13697
ID  - fs13697
ER  -