METROPOLITAN SEWERAGE SYSTEM SURROUNDING BOSTON. ECTIONAL VIEW-CHELSEA AND EAST BOSTON TUNNEL. MANNER OP SEWER CONSTRUCTION-CARSON TRENCH MACHINE AT WORK., scientific american, 1892-12-17


METROPOLITAN SEWERAGE SYSTEM SURROUNDING BOSTON. ECTIONAL VIEW-CHELSEA AND EAST BOSTON TUNNEL. MANNER OP SEWER CONSTRUCTION-CARSON TRENCH MACHINE AT WORK., scientific american, 1892-12-17


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