TY - RPRT TI - MODFLOW-2005 : the U.S. Geological Survey modular ground-water model--the ground-water flow process AU - Arlen W. Harbaugh PY - 2005 DO - 10.3133/tm6a16 UR - https://pubs.usgs.gov/publication/tm6A16 ID - tm6A16 ER -