TY  - RPRT
TI  - Distribution of selected nitrogen compounds in ground water and the unsaturated zone, Superior-Hardy Special Protection Area, Nuckolls County, Nebraska, 1991-93
AU  - A. H. Chen
PY  - 1996
DO  - 10.3133/wri964239
UR  - https://pubs.usgs.gov/publication/wri964239
ID  - wri964239
ER  -