TY  - RPRT
TI  - Evaluation of methods for delineating areas that contribute water to wells completed in valley-fill aquifers in Pennsylvania
AU  - Dennis W. Risser
AU  - Thomas M. Madden
PY  - 1994
DO  - 10.3133/ofr92635
UR  - https://pubs.usgs.gov/publication/ofr92635
ID  - ofr92635
ER  -