TY  - RPRT
TI  - Nitrogen isotopes as indicators of NOx source contributions to atmospheric nitrate deposition across the midwestern and northeastern United States
AU  - Emily M. Elliott
AU  - Carol Kendall
AU  - Scott D. Wankel
AU  - Douglas A. Burns
AU  - E.W. Boyer
AU  - K. Harlin
AU  - Daniel J Bain
AU  - T.J. Butler
PY  - 2007
DO  - 10.1021/es070898t
UR  - https://pubs.usgs.gov/publication/70031339
ID  - 70031339
ER  -