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 Hornchurch]
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AMOUNT OF SOLUBLE AND INSOLUBLE MATTER RECORD
BY DEPOSIT GAUGE SlTED AT RAINHAM SECONDARY SCHQOL
AUGUST- NQVEMBER. 1948 SOLUBLE
INSOLUBLE