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map background search result map search result map 79 Mine Section 79 Mine Surface Geology 79 Mine 6th Level Geologic Map of 79 Mine Area 79 Mine Section 600 Level Geologic Map of the 79 Mine Area Callahan Zinc-Lead Co., Duquesne Unit, Property Outline Showing Principal Mining Areas 79 Mine, 300 Level 79 Mine Level Composite Callahan Zinc-Lead Co., Topographic Map Southern Section 79 Mine, Geologic Map of 6th Level 79 Mine, 400 Level 79 Mine Cross Section 79 Mine 5th Level 79 Mine, 500 Level 79 Mine, Composite Level Plan 79 Lead - Copper Co. Surface Map 79 Lead-Copper Co., Section 79 Lead-Copper Co., Surface Map Over Developed Area and East Extension 79 Lead-Copper Co., Surface Map No. 1