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 1902
[Report of the Medical Officer of Health for London County Council]
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DIAGRAM showing the simultaneous variations in the number of microorganisms, the proportion of carbon dioxide and
the amount of organic matter in the air of the Central London Railway, in the twelve observations made.