TY  - RPRT
TI  - Nitrogen isotopes in nitrate from surface water and shallow groundwater at Sixmile Creek, southeastern Colorado
AU  - Craig A. Johnson
AU  - Robert A. Zielinski
AU  - Sigrid A. Asher-Bolinder
PY  - 1995
DO  - 10.3133/ofr95536
UR  - https://pubs.usgs.gov/publication/ofr95536
ID  - ofr95536
ER  -