TY  - GEN
CN  - I 19.76:
CY  - Towson, Md. :
CY  - Denver, Colo. :
ID  - 219610
KW  - Groundwater
KW  - Aquifers
N1  - Potentiometric contours.
N1  - "Base from USGS Digital line graph, 250,000."
N1  - Coordinates for map based on: Sept. 1990.
N1  - Description based on: Sept. 1990.
PB  - U.S. Geological Survey ;
PB  - Books and Open-File Reports [Section, distributor,
PP  - Towson, Md. :
PP  - Denver, Colo. :
T1  - Difference between the potentiometric surfaces of the Magothy Aquifer of ... and ... in southern Maryland
TI  - Difference between the potentiometric surfaces of the Magothy Aquifer of ... and ... in southern Maryland
ER  -