TY  - RPRT
TI  - Hydrogeology of the Helena Valley-fill aquifer system, west-central Montana
AU  - D.W. Briar
AU  - J.P. Madison
PY  - 1992
DO  - 10.3133/wri924023
UR  - https://pubs.usgs.gov/publication/wri924023
ID  - wri924023
ER  -