Knightsville Dam, Borrow Pit "C," north bank, sample no. 2 at left, 6' depth, sample no. 3 at right, 11' depth, Quabbin Reservoir, Mass., Apr. 24, 1941

Knightsville Dam, Borrow Pit "C," north bank, sample no. 2 at left, 6' depth, sample no. 3 at right, 11' depth, Quabbin Reservoir, Mass., Apr. 24, 1941

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