TY  - RPRT
TI  - Regional patterns of total nitrogen concentrations in the National Rivers and Streams Assessment
AU  - James M. Omernik
AU  - Steven G. Paulsen
AU  - Glenn E. Griffith
AU  - Marc H. Weber
PY  - 2016
DO  - 10.2489/jswc.71.3.167
UR  - https://pubs.usgs.gov/publication/70171438
ID  - 70171438
ER  -