TY  - RPRT
TI  - The area of influence of an exploratory hole
AU  - D.A. Singer
AU  - L. J. Drew
PY  - 1976
DO  - 10.2113/gsecongeo.71.3.642
UR  - https://pubs.usgs.gov/publication/70197188
ID  - 70197188
ER  -