Groundwater /

由 Freeze, R. Allan, Cherry, John A.
Englewood Cliffs, N.J. : Prentice-Hall, 1979

Hydrogeology of the carbonate rocks of the Lancaster 15-minute quadrangle, southeastern Pennsylvania,

由 Meisler, Harold, Becher, Albert E.
Harrisburg [Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey] 1971