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2. The organisation of a maternity service;Murray, E.F.;BrMedJ,1929
3. The Newcastle upon Tyne obstetric emergency services;Stabler, F.;BrMedJ,1947
4. The obstetric flying squad;Stabler, F.;BrMedJ,1957
5. The emergency obstetrical service. A review of 489 cases in the Manchester area;Dewhurst, C.J.;Lancet,1952