District of Columbia. Report upon maintenance and repair of Washington Aqueduct and Washington Aqueduct filtration plant, W. C. Langfitt in charge; app. DDD, report of chief of engineers, 1912.
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District of Columbia. Report upon maintenance and repair of Washington Aqueduct and Washington Aqueduct filtration plant, W. C. Langfitt in charge; app. DDD, report of chief of engineers, 1912.
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District of Columbia. Report upon maintenance and repair of Washington Aqueduct and Washington Aqueduct filtration plant, W. C. Langfitt in charge; app. DDD, report of chief of engineers, 1912.