TY - RPRT TI - Documentation for the MODFLOW 6 Groundwater Transport Model AU - Christian D. Langevin AU - Alden M. Provost AU - Sorab Panday AU - Joseph D. Hughes PY - 2022 DO - 10.3133/tm6a61 UR - https://pubs.usgs.gov/publication/tm6A61 ID - tm6A61 ER -