TY - RPRT TI - Summary of selected computer programs produced by the U.S. Geological Survey for simulation of ground-water flow and quality, 1994 AU - Charles A. Appel AU - Thomas E. Reilly PY - 1994 DO - 10.3133/cir1104 UR - https://pubs.usgs.gov/publication/cir1104 ID - cir1104 ER -