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1by Ashley, Geo. H. (George Hall), 1866-1951Subjects: “...Natural gas Pennsylvania....”
Published 1922
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2by Sisler, James D. (James Donaldson), 1894-Subjects: “...Natural gas Pennsylvania....”
Published 1933
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4Published 1982Subjects: “...Natural gas Pennsylvania Maps....”
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5Published 1984Subjects: “...Natural gas Pennsylvania Rates....”
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6by Fettke, Charles R. (Charles Reinhard), 1888-1959Subjects: “...Natural gas Pennsylvania Washington County....”
Published 1946
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7by Sherrill, R. E. (Richard Ellis), 1899-1952Subjects: “...Natural gas Pennsylvania....”
Published 1941
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9by Fettke, Charles R. (Charles Reinhard), 1888-1959Subjects: “...Natural gas Pennsylvania....”
Published 1961
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10Published 1982Subjects: “...Natural gas Pennsylvania Philadelphia....”
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11Published 1985Subjects: “...Natural gas Pennsylvania Pipe line failures....”
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12by Fettke, Charles R. (Charles Reinhard), 1888-1959Subjects: “...Natural gas Pennsylvania....”
Published 1953
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13Published 1993Subjects: “...Natural gas Pennsylvania Maps....”
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15by Dickey, Parke Atherton, 1909-Subjects: “...Natural gas Pennsylvania Oil City Region....”
Published 1943
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16by Stone, Ralph W. (Ralph Walter), 1876-1964, Clapp, Frederick G. (Frederick Gardner), 1879-1944Subjects: “...Natural gas Pennsylvania Greene County....”
Published 1907
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17by Munn, M. J. (Malcolm John), 1874-1949Subjects: “...Natural gas Pennsylvania....”
Published 1911
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19by Richardson, G. B. (George Burr), 1872-1949Subjects: “...Natural gas Pennsylvania New Kensington....”
Published 1932
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