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	1.	Ground-water supplies in shale and sandstone in Fairfax, Loudoun, and Prince William Counties, Virginia. by Johnston, P. M. (Paul McKelvey), 1904-1989 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, [U.S. Geological Survey] 1960 Availability: No items available. Add to cart (remove)
	2.	Geology and ground-water resources of Washington, D. C., and vicinity / with a section on chemical quality of the water by D. E. Weaver and Leonard Siu. by Johnston, P. M. (Paul McKelvey), 1904-1989 Series: Water-supply paper (Washington, D.C.) ; 1776. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington : U.S. Govt. Print. Off., 1964 Availability: No items available. Add to cart (remove)

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