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3. Facts concerning the practical working of the sub-surface irrigation system of sewage disposal in New Jersey and elsewhere: a paper read before the New Jersey Sanitary Association, at their tenth annual meeting, in the Assembly Chamber at the State House, Trenton, N.J., December 4, 1884

4. 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