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1
Ground water in southwestern Pennsylvania /
by Piper, Arthur M. (Arthur Maine), 1898-1989
Harrisburg : Dept. of Internal Affairs, Topographic and Geologic Survey, 1933

Book
3
Oil fields of the Greater Pittsburgh region / by William S. Lytle, Pennsylvania Geological Survey. Prepared by the Pennsylvania Geological Survey in cooperation with the United States Geological Survey.
Harrisburg : Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey, 1976

Book
4
The 1980 eruptions of Mount St. Helens, Washington /
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 1982

Book
5
Fluvial monazite deposits in the southeastern United States,
Washington, U.S. Govt. Print. Off., 1968

Book
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