Wachusett Reservoir, North Dike, westerly portion, stratification on the north side of cut-off trench, station 60+75; from the south, Clinton, Mass., Sep. 12, 1899

Wachusett Reservoir, North Dike, westerly portion, stratification on the north side of cut-off trench, station 60+75; from the south, Clinton, Mass., Sep. 12, 1899

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