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81.
The geology of the South Mountain belt of Berks County. by Series: Report of progress (Geological Survey of Pennsylvania) ; D3, v. 2, pt. 1.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Board of Commissioners for the Second Geological Survey, 1883
Availability: No items available.

82.
Special report on the trap dykes and Azoic rocks of southeastern Pennsylvania. By T. Sterry Hunt. Part I. Historical introduction. by Series: Report of progress (Geological Survey of Pennsylvania) ; E.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pub. by the Board of commissioners for the Second geological survey, 1878
Availability: No items available.

83.
84.
A preliminary report on the palaeontology of Perry county, describing the order and thickness of its formations and its folded and faulted structure. By E.W. Claypole ... by Series: Report of progress (Geological Survey of Pennsylvania) ; F2.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pub. by the Board of commissioners for the Second geological survey, 1885
Availability: No items available.

85.
86.
Oil well records and levels. By John F. Carll. by Series: Report of progress (Geological Survey of Pennsylvania) ; II.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pub. by the Board of Commissioners for the Second Geological Survey, 1877
Availability: No items available.

87.
88.
Catalogue of the Geological museum. By Charles E. Hall [and others] by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Board of Commissioners for the Second Geological Survey, 1878-89
Availability: No items available.

89.
Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States ... By Leo Lesquereux. by Series: Report of progress (Geological Survey of Pennsylvania) ; P.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Board of Commissioners for the Second Geological Survey, 1879-84
Availability: No items available.

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93.
Economic geology of the Amity quadrangle, eastern Washington County, Pennsylvania / by Frederick G. Clapp. by Series: Geological Survey (U.S.). Bulletin ; no. 300.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. Print. Off., 1907
Availability: No items available.

94.
Topographic and geological survey of Pennsylvania made in co-operation with the United States Geological Survey, 1899-1906. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Harrisburg Publishing Co., state printer, 1906
Availability: No items available.

95.
96.
Geology of the oil and gas fields in Sewickley quadrangle, by M. J. Munn. Surveyed in co-operation with the United States Geological survey. by Series: Pennsylvania. Topographic and geologic survey. Report ; no. 1
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, C. E. Aughinbaugh, printer to the stae of Pennsylvania, 1910
Availability: No items available.

97.
Geology of the oil and gas fields of the Clarion quadrangle, by M. J. Munn. Surveyed in cooperation with the United States Geological Survey. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, C. E. Aughinbaugh, 1910
Availability: No items available.

98.
Oil and gas fields of the Carnegie quadrangle, Pennsylvania / by Malcolm J. Munn. by Series: United States. Bulletin ; 456.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. Print. Off., 1911
Availability: No items available.

99.
The mineralogy of Pennsylvania, by John Eyerman. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Easton, Pa., 1889-1911
Availability: No items available.

100.
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