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Penn Mine slag dump and mine water, Calaveras County, Calif.

Published Year

• 1940-1949 (1)

Subject

• Mine water--California--Calaveras County (1)
• Salvage (Waste, etc.)--California--Calaveras County (1)
• Slag--California--Calaveras County (1) *

Author

• Ricker, Spangler. (1) *
• Wiebelt, Frank Joseph. (1)

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