Two volumes containing reports, correspondence, statistics, replies to questionnaires, etc., all relating to public health, infectious diseases, sanitation, housing, etc., accumulated or written by Morgan James Rees when he was medical officer of health in Aberdare and afterwards in the employ of the Local Government Board. They relate to Aberdare, Caernarvon, St Dogmaels Rural District Council and Swansea, also to certain districts in England.