Wachusett Reservoir, North Dike, easterly portion, main cut-off trench, stratification of sand, ending abruptly against margin of plain, Clinton, Mass., Nov. 13, 1898
Wachusett Reservoir, North Dike, easterly portion, main cut-off trench, stratification of sand, ending abruptly against margin of plain, Clinton, Mass., Nov. 13, 1898
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Wachusett Reservoir, North Dike, easterly portion, main cut-off trench, stratification of sand, ending abruptly against margin of plain, Clinton, Mass., Nov. 13, 1898