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Papers of James Alexander Chalmers, 1951-1979, including draft articles, unpublished papers and reprints by Chalmers both on the history of the vacuum extractor and on his use of it in obstetric practice at Worcester Royal Infirmary; Chalmers' personal copy of The Ventouse - The Obstetric Vacuum Extractor (London: Lloyd-Luke, 1971) and press cuttings of reviews; reprints, photographs, illustrations and other material gathered by Chalmers during the course of his research into the history and development of the vacuum extractor.