TY  - RPRT
TI  - Phosphorus runoff risk assessment in karstic regions of the U.S.
AU  - Andrew N. Sharpley
AU  - Phillip D. Hays
AU  - Michael B. Daniels
AU  - Karl W. VanDevender
PY  - 2020
DO  - 10.1002/ael2.20001
UR  - https://pubs.usgs.gov/publication/70208582
ID  - 70208582
ER  -