STANDARDS OF MECHANICAL FILTRATION PLANT PERFORMANCE.
The standards suggested in this paper are the result of a study of the operation of filtration plants in Maryland upon which the writer was detailed under the general direction of Mr. R. B. Morse, Chief Engineer, Maryland State Department of Health. Acknowledgment is given here both to him and the writer's brother, Dr. Leo Wolman, for helpful criticism of the various statistical problems involved in the discussion.
Wolman
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Northern District, Maryland State Department of Health.