TY  - RPRT
TI  - Long-term frozen storage of stream water samples for dissolved orthophosphate, nitrate plus nitrite, and ammonia analysis
AU  - Ronald J. Avanzino
AU  - Vance C. Kennedy
PY  - 2010
DO  - 10.1029/93wr01684
UR  - https://pubs.usgs.gov/publication/70185433
ID  - 70185433
ER  -