London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
London County Council 1899
[Report of the Medical Officer of Health for London County Council]
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Diagram 2—Percentage purification of crude sewage by coke-beds. These percentages have
been calculated from the oxygen absorbed in four hours from permanganate by the raw sewage and by
the effluent respectively. Daily averages—