TY  - RPRT
TI  - External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1994
AU  - J.D. Gordon
AU  - M.A. Nilles
AU  - D.K. Polascek
AU  - M.E. Ratcliff
PY  - 1997
DO  - 10.3133/wri974201
UR  - https://pubs.usgs.gov/publication/wri974201
ID  - wri974201
ER  -