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 1926

[Report of the Medical Officer of Health for London County Council]

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61
Graph showing radius of visibility during (1) a fine summer day,
(2) a fair winter day, and (3) a misty winter day.