TY  - RPRT
TI  - A method for nitrate collection for δ 15 N and δ 18 O analysis from waters with low nitrate concentrations
AU  - Cecily C.Y. Chang
AU  - J. Langston
AU  - M. Riggs
AU  - K. Campbell
AU  - S. R. Silva
AU  - C. Kendall
PY  - 1999
DO  - 10.1139/f99-126
UR  - https://pubs.usgs.gov/publication/70021670
ID  - 70021670
ER  -