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121.
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.

122.
Geology and mineral resources of the Honeybrook and Phoenixville quadrangles, Pennsylvania, by F. Bascom and G.W. Stose. by Series: U.S. Geological survey. Bulletin 891
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Govt. Print. Off., 1938
Availability: No items available.

123.
124.
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.

125.
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127.
... Problems and trends in the mineral industries of Pennsylvania / by W. M. Myers ... by Series: Pennsylvania. State College. Mineral Industries Experiment Station. Bulletin 17 [i.e. 27] | The Pennsylvania state college bulletin ; vol. 33, no. 34, June 26, 1939
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: State College, Pa., School of Mineral Industries, The Pennsylvania State College, 1939
Availability: No items available.

128.
129.
Highway geology, Philadelphia to Pittsburgh, by Bradford Willard. by Series: Bulletin G ; 12
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939
Availability: No items available.

130.
Guide to the geology from Dauphin to Sunbury, by Bradford Willard. by Series: Bulletin G ; 13
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939
Availability: No items available.

131.
Guidebook to the geology near Reading, Pa., by Bradford Willard and Donald M. Fraser. by Series: Bulletin G ; 15
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939
Availability: No items available.

132.
Guidebook to the geology about Pittsburgh, by Henry Leighton. by Series: Bulletin G ; 17
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939
Availability: No items available.

133.
The minerals of Pennsylvania: Iron ores of Pennsylvania, by William O. Hickok, IV. by Series: Bulletin M ; 18-B
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939
Availability: No items available.

134.
The minerals of Pennsylvania: Non-metallic minerals, by R. W. Stone. by Series: Bulletin M ; 18-C
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939
Availability: No items available.

135.
Pre-Cambrian geology and mineral resources of the Delaware Water Gap and Easton quadrangles, New Jersey and Pennsylvania, by W. S. Bayley. by Series: U. S. Geological Survey. Bulletin 920
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Gov't. Print. Off., 1941
Availability: No items available.

136.
Music mountain oil pool and other oil pools in Lafayette township, McKean county, Pennsylvania / by Chas. R. Fettke. by Series: Pennsylvania. Progress report ; 125.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Harrisburg, 1941]
Availability: No items available.

137.
Ground-water resources of Pennsylvania, by Stanley W. Lohman. Prepared in cooperation between the Geological Survey, United States Department of the Interior, and the Pennsylvania Topographic and Geologic Survey. by Series: Bulletin W ; 7.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Harrisburg, Pa., Dept. of Internal Affairs, Topographic and Geologic Survey, 1941
Availability: No items available.

138.
The upper Devonian and lower Mississippian of southwestern Pennsylvania / by Wilson M. Laird. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Harrisburg : 1941]
Availability: No items available.

139.
Guidebook to the geology of the Pennsylvania turnpike, by A. B. Cleaves and 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, 1942
Availability: No items available.

140.
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