Wachusett Reservoir, North Dike, easterly portion, stratification on north side of secondary cut-off trench, station 13+50; from the south, Clinton, Mass., Jun. 5, 1899

Wachusett Reservoir, North Dike, easterly portion, stratification on north side of secondary cut-off trench, station 13+50; from the south, Clinton, Mass., Jun. 5, 1899

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