TY - RPRT TI - MODFLOW–USG version 1: An unstructured grid version of MODFLOW for simulating groundwater flow and tightly coupled processes using a control volume finite-difference formulation AU - Sorab Panday AU - Christian D. Langevin AU - Richard G. Niswonger AU - Motomu Ibaraki AU - Joseph D. Hughes PY - 2013 DO - 10.3133/tm6a45 UR - https://pubs.usgs.gov/publication/tm6A45 ID - tm6A45 ER -