Wachusett Aqueduct, boulders in trench near Bartlett's Pond, Section 9, station 397, from the south, Northborough, Mass., Apr. 12, 1897

Wachusett Aqueduct, boulders in trench near Bartlett's Pond, Section 9, station 397, from the south, Northborough, Mass., Apr. 12, 1897

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