TY  - RPRT
TI  - Perspective on problems of hydrogeology
AU  - H. E. LeGrand
PY  - 1962
DO  - 10.1130/0016-7606(1962)73[1147:popoh]2.0.co;2
UR  - https://pubs.usgs.gov/publication/70220778
ID  - 70220778
ER  -