TY  - RPRT
TI  - Regional ground-water flow concepts in the United States: Historical perspective
AU  - J.D. Bredehoeft
AU  - W. Back
AU  - B.B. Hanshaw
PY  - 1982
DO  - 10.1130/spe189-p295
UR  - https://pubs.usgs.gov/publication/70188843
ID  - 70188843
ER  -