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8. Sewerage of cities: a reply to the paper of Col. George E. Waring, C.E., of Newport, R.I., on "The Liernur system of sewerage for Baltimore" : an important question, involving the interests of health, commerce and agriculture

14. Sewage purification

20. The purification of sewage by bacterial oxidation: a study of the natural processes of filth removal and of the means by which their efficiency may be artificially intensified : including a description of works for sewage disposal at Willow Grove Park, Philadelphia, Pa