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3Near-surface helium anomalies associated with faults and gas accumulations in western Pennsylvania /by Roberts, Alan A.
Published 1985Government Document Microform Book -
4Published 1986Government Document Microform Book
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8Published 1991Government Document Microform Book
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18by Gage, B. D.This former electronic address redirects to current address when searched on Aug. 19, 2004
Published 2001
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