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 6. showing, as regards Crossness crude sewage, the percentage deviation from the mean in 10 samples examined bacteriologically for the total
number of bacteria, the number of spores of bacteria, and the number of liquefying bacteria.