TY  - RPRT
TI  - Documentation of computer programs to compute and display pathlines using results from the U.S. Geological Survey modular three-dimensional finite-difference ground-water flow model
AU  - David W. Pollock
PY  - 1989
DO  - 10.3133/ofr89381
UR  - https://pubs.usgs.gov/publication/ofr89381
ID  - ofr89381
ER  -