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The Philadelphia water supply: report of the Commission of 1878 : showing that the Fairmont works realize less than thirty per cent. of their proper effect--and even this after the machinery had been put in repair for the experiments of the Commission
The Philadelphia water supply: report of the Commission of 1878 : showing that the Fairmont works realize less than thirty per cent. of their proper effect--and even this after the machinery had been put in repair for the experiments of the Commission