TY  - RPRT
TI  - Transient energy dissipation methods of measuring permeability distributions in unconfined heterogeneous porous materials
AU  - R. William Nelson
AU  - William L. McCollum
PY  - 1972
DO  - 10.3133/ofr72270
UR  - https://pubs.usgs.gov/publication/ofr72270
ID  - ofr72270
ER  -