TY  - RPRT
TI  - Temporal changes in nitrogen and phosphorus concentrations with comparisons to conservation practices and agricultural activities in the Lower Grand River, Missouri and Iowa, and selected watersheds, 1969–2015
AU  - Heather M. Krempa
AU  - Allison K. Flickinger
PY  - 2017
DO  - 10.3133/sir20175067
UR  - https://pubs.usgs.gov/publication/sir20175067
ID  - sir20175067
ER  -