TY  - RPRT
TI  - External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network, 1997-99
AU  - John D. Gordon
AU  - Natalie E. Latysh
AU  - Sandy J. Lindholm
PY  - 2003
DO  - 10.3133/wri034027
UR  - https://pubs.usgs.gov/publication/wri034027
ID  - wri034027
ER  -