TY  - RPRT
TI  - User guide for MODPATH Version 7—A particle-tracking model for MODFLOW
AU  - David W. Pollock
PY  - 2016
DO  - 10.3133/ofr20161086
UR  - https://pubs.usgs.gov/publication/ofr20161086
ID  - ofr20161086
ER  -