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Fig. 61a.
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Fig. 61b.
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ECONOMIC MAP of the Central Mineral Region.BYThe. . .
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Section through the Northern Copper Field, along
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Section from C to D on map (Plate XXI), crossing
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Section and plan. . .
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Plan and section. . .
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Plan and section . . .
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Section on line K-L of map (Plate XXI), crossing t. . .
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EXPOSURE OF UPPER CAMBRIAN SHALES (POTSDAM FLAGS) . . .
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Plan and section along line M-N of map (Plate XXI). . .
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