TY  - RPRT
TI  - External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network, 1995-96
AU  - John D. Gordon
PY  - 1999
DO  - 10.3133/wri994072
UR  - https://pubs.usgs.gov/publication/wri994072
ID  - wri994072
ER  -