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Filter: Subject of Electric power
Filter: Subject of machinery
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| Date: | 06 16 1912 |
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| Description: | Elevated view of steam powered pile drivers at work on the coffer dam. |
| Date: | 06 13 1913 |
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| Description: | Workmen and machinery at the quarry on Blackhawk Bluff. The gravel was used in construction of the power dam. |
| Date: | 08 1938 |
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| Description: | Mine building at a gold and mica mine operated by the Mineral Mining Corporation. A body of water is in the foreground on the left side of a partially cons... |
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