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History
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Calaveras County view
Calaveras County view
California Caverns – Calaveras County
California Caverns – Calaveras County
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This is a photo taken looking down into the Empire Mine Shaft in Grass Valley, California.
This is a photo taken looking down into the Empire Mine Shaft in Grass Valley, California.
This was a hole in the mountain in La Porte, California. It was used to divert the water in Slate Creek.
This was a hole in the mountain in La Porte, California. It was used to divert the water in Slate Creek.