TY  - RPRT
TI  - The use of surface geophysical techniques to detect fractures in bedrock; an annotated bibliography
AU  - Mark R. Lewis
AU  - F.P. Haeni
PY  - 1987
DO  - 10.3133/cir987
UR  - https://pubs.usgs.gov/publication/cir987
ID  - cir987
ER  -