TY - RPRT TI - MODFLOW-2000, the U.S. Geological Survey Modular Ground-Water Model -Documentation of the Hydrogeologic-Unit Flow (HUF) Package AU - E.R. Anderman AU - M. C. Hill PY - 2000 DO - 10.3133/ofr00342 UR - https://pubs.usgs.gov/publication/ofr00342 ID - ofr00342 ER -