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	1.	Slate in Northampton County, Pennsylvania, by Charles H. Behre, Jr. by Behre, Chas. H. (Charles H.) Series: Bulletin M ; 9. Material type: 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. Add to cart (remove)
	2.	Bituminous coal fields of Pennsylvania. by Pennsylvania. Bureau of Topographic and Geologic Survey Ashley, Geo. H. (George Hall), 1866- Sisler, James Donaldson, 1894- Reese, John F United States. Bureau of Mines Series: Pennsylvania. Bulletin M 6 ; Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, 1925- Availability: No items available. Add to cart (remove)
	3.	Building stones of Pennsylvania / by Ralph W. Stone. by Stone, Ralph W. (Ralph Walter), 1876-1964 Pennsylvania. Bureau of Topographic and Geologic Survey Series: Bulletin M ; 15 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa. : Dept. of Internal Affairs, Topographic and Geologic Survey, 1932 Availability: No items available. Add to cart (remove)
	4.	The undeveloped mineral resources of Pennsylvania / introduction by George H. Ashley. by Ashley, Geo. H. (George Hall), 1866- Series: Bulletin M ; 18-A. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Harrisburg, Pa. : Department of internal affairs, Topographic and geologic survey, 1933 Availability: No items available. Add to cart (remove)
	5.	The minerals of Pennsylvania: Iron ores of Pennsylvania, by William O. Hickok, IV. by Hickok, William Orville, 1905- Series: Bulletin M ; 18-B 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.	The minerals of Pennsylvania: Non-metallic minerals, by R. W. Stone. by Stone, Ralph W. (Ralph Walter), 1876-1964 Series: Bulletin M ; 18-C 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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