TY  - RPRT
TI  - Potential nitrogen critical loads for northern Great Plains grassland vegetation
AU  - Amy J. Symstad
AU  - Anine T. Smith
AU  - Wesley E. Newton
AU  - Alan K. Knapp
PY  - 2015
UR  - https://pubs.usgs.gov/publication/70155195
ID  - 70155195
ER  -