TY  - RPRT
TI  - The difference between the potentiometric surfaces of the upper Patapsco aquifer, September 1990 and September 1997 in southern Maryland
AU  - Stephen E. Curtin
AU  - David C. Andreasen
AU  - Frederick K. Mack
PY  - 1999
DO  - 10.3133/ofr9986
UR  - https://pubs.usgs.gov/publication/ofr9986
ID  - ofr9986
ER  -