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	1.	Pennsylvania caves, by Ralph W. Stone. by Stone, Ralph W. (Ralph Walter), 1876-1964 Series: Bulletin G ; 3. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Department of internal affairs, Topographic and geologic survey, 1930 Availability: No items available. Add to cart (remove)
	2.	A syllabus of Pennsylvania geology and mineral resources / by George H. Ashley. by Ashley, Geo. H. (George Hall), 1866- Series: Bulletin G ; 1. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg : Department of internal affairs, Topographic and geologic survey, 1931 Availability: No items available. Add to cart (remove)
	3.	Recent geological history of the Delaware Valley below the Water Gap / by Freeman Ward. by Ward, Freeman, 1879- Series: Bulletin G ; 10 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa. : Dept. of Internal Affairs, Topographic and Geologic Survey, 1938 Availability: No items available. Add to cart (remove)
	4.	The Devonian of Pennsylvania : Middle and upper Devonian / by Bradford Willard; Keyser limestone and Helderberg group, by Frank M. Swartz; Oriskany group, by Arthur B. Cleaves. by Pennsylvania. Bureau of Topographic and Geologic Survey Willard, Bradford, 1894- Swartz, Frank M. (Frank McKim), 1899- Cleaves, Arthur B. (Arthur Bailey), 1905- Series: Bulletin G ; 19 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa. : Dept. of internatl affairs, Topographic and geologic survey, 1939 Availability: No items available. Add to cart (remove)
	5.	Highway geology, Philadelphia to Pittsburgh, by Bradford Willard. by Willard, Bradford, 1894- Series: Bulletin G ; 12 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939 Availability: No items available. Add to cart (remove)
	6.	Guide to the geology from Dauphin to Sunbury, by Bradford Willard. by Willard, Bradford, 1894- Series: Bulletin G ; 13 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939 Availability: No items available. Add to cart (remove)
	7.	Guidebook to the geology near Reading, Pa., by Bradford Willard and Donald M. Fraser. by Willard, Bradford, 1894- Fraser, Donald McCoy, 1903- [joint author.] Series: Bulletin G ; 15 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939 Availability: No items available. Add to cart (remove)
	8.	Guidebook to the geology about Pittsburgh, by Henry Leighton. by Leighton, Henry, 1884- Series: Bulletin G ; 17 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939 Availability: No items available. Add to cart (remove)

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