TY  - RPRT
TI  - Potentiometric surface maps and water-level change map, 1960-76, for the lower aquifer of the Cretaceous Potomac Group in Fairfax County, Virginia
AU  - Richard H. Johnston
AU  - J. D. Larson
PY  - 1977
DO  - 10.3133/ofr77284
UR  - https://pubs.usgs.gov/publication/ofr77284
ID  - ofr77284
ER  -