Wachusett Reservoir, North Dike, westerly portion, brickwork on ledge, station 20; main cut-off trench with sheet piling, Clinton, Mass., May 11, 1900

Wachusett Reservoir, North Dike, westerly portion, brickwork on ledge, station 20; main cut-off trench with sheet piling, Clinton, Mass., May 11, 1900

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