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Filter: Subject of Electric power
Filter: Subject of quarries and quarrying
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| 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: | 06 13 1913 |
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| Description: | A view, from the west, of the quarry on Blackhawk Bluff. Gravel from the quarry was used in concrete for the construction of the power plant and dam. |
| Date: | |
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| Description: | Group portrait of men posing standing near and on a rock face with shovels and pickaxes. Behind them are shrubs and trees on a hill, with a power line at t... |
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