TY  - RPRT
TI  - Groundwater technical procedures of the U.S. Geological Survey
AU  - William L. Cunningham
AU  - Charles W. Schalk
PY  - 2011
DO  - 10.3133/tm1a1
UR  - https://pubs.usgs.gov/publication/tm1A1
ID  - tm1A1
ER  -