Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
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Diagram 3, showing the total number of bacteria in 1 cc. of Crossness crude sewage (ten
samples); in 1 cc. of effluent from 4-foot coke-bed (eight samples); and in 1 cc. of effluent from 6-foot
coke-bed (two samples).