title: USGS directions in MODFLOW development.
authors.affiliation: US Geological Survey, Office of Ground Water, MS 411 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192, USA. pbarlow@usgs.gov
authors.forename: Paul M
authors.initials: PM
authors.lastname: Barlow
authors.forename: Arlen W
authors.initials: AW
authors.lastname: Harbaugh
mesh_terms: D003198:Computer Simulation; D055593:Geological Phenomena; D005844:Geology; D012984:Software; D014481:United States; D014867:Water
chemical_list: D014867:Water