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81.
Preliminary report on the talc and serpentine of Northampton County and the Portland cement materials of the Lehigh District, by Frederick B. Peck. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, C. E. Aughinbaugh, 1911
Availability: No items available.

82.
Graphite deposits of Pennsylvania, by Benjamin L. Miller ... by Series: Pennsylvania. Topographic and geologic survey. Report ; no. 6
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, C.E. Aughinbaugh, printer to the state of Pennsylvania, 1912
Availability: No items available.

83.
Minerals of Pennsylvania, by Amos P. Brown and Frederick Ehrenfeld. by Series: Pennsylvania. Topographic and Geologic Survey. Report ; no. 9
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., W. S. Ray, 1913
Availability: No items available.

84.
Geologic map of southwestern Pennsylvania. by Series: Pennsylvania. Report ; no. 2.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., W. S. Ray, State Printer, 1914
Availability: No items available.

85.
The mineral production of Pennsylvania, 1911, 1913. by Series: Pennsylvania. Report ; 8, 11.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa. [1912?-14?]
Availability: No items available.

86.
The mineral wealth of Virginia tributary to the lines of the Norfolk and western and Shenandoah valley railroad companies. By Andrew S. McCreath. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., L. S. Hart, printer and binder, 1884
Availability: No items available.

87.
Oil and gas map of southwestern Pennsylvania, 1915. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., W. S. Ray, State Printer, 1916
Availability: No items available.

88.
Glass manufacture and the glass sand industry of Pennsylvania, by Charles Reinhard Fettke, Ph.D. by Series: Pennsylvania. Topographic and geologic survey. Report no. XII
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Penna., J. L. L. Kuhn, printer, 1918 [i.e.1919]
Availability: No items available.

89.
Slate in Northampton County, Pennsylvania, by Charles H. Behre, Jr. by Series: Bulletin M ; 9.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Dept. of Forests and Waters, Topographic and Geologic Survey, 1927
Availability: No items available.

90.
91.
Pennsylvania caves, by Ralph W. Stone. by Series: Bulletin G ; 3.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Department of internal affairs, Topographic and geologic survey, 1930
Availability: No items available.

92.
The Pennsylvania geological survey; administrative report, by Geo. H. Ashley. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Dept. of internal affairs, Topographic and geologic survey, 1931
Availability: No items available.

93.
A syllabus of Pennsylvania geology and mineral resources / by George H. Ashley. by Series: Bulletin G ; 1.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg : Department of internal affairs, Topographic and geologic survey, 1931
Availability: No items available.

94.
Geology and mineral resources of Adams county, Pennsylvania, by George W. Stose. by Series: Bulletin C ; 1.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Department of internal affairs, Topographic and geologic survey, 1932
Availability: No items available.

95.
Building stones of Pennsylvania / by Ralph W. Stone. by Series: Bulletin M ; 15
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa. : Dept. of Internal Affairs, Topographic and Geologic Survey, 1932
Availability: No items available.

96.
97.
The undeveloped mineral resources of Pennsylvania / introduction by George H. Ashley. by Series: Bulletin M ; 18-A.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa. : Department of internal affairs, Topographic and geologic survey, 1933
Availability: No items available.

98.
99.
Recent geological history of the Delaware Valley below the Water Gap / by Freeman Ward. by Series: Bulletin G ; 10
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa. : Dept. of Internal Affairs, Topographic and Geologic Survey, 1938
Availability: No items available.

100.
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