TY  - RPRT
TI  - A computer program for simulating geohydrologic systems in three dimensions
AU  - D.R. Posson
AU  - G. A. Hearne
AU  - J.V. Tracy
AU  - P. F. Frenzel
PY  - 1980
DO  - 10.3133/ofr80421
UR  - https://pubs.usgs.gov/publication/ofr80421
ID  - ofr80421
ER  -