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Two dogs harnessed to coal carts. About 1890, Ohio Coal Mine. This photograph is the property of Pittsburgh Consolidation Coal Co.

1. Dogs in Harness, Ohio Coal Mine

Two miners watching dogs haul loads of coal.

2. Dog Mines, Zanesville, Ohio

Two miners watching dogs haul loads of coal.

3. Dog Mines, Zanesville, Ohio

Miners and horses and dogs used to haul cart loads full of coal.

4. Dog Mines, Zanesville, Ohio