AU - Ed:Reynolds, LA AU - Tansey, E M TI - Wellcome Witnesses to Twentieth Century Medicine. Population-based Research in South Wales:The MRC Pneumoconiosis REsearch Unit and the MRC Epidemiology Unit SN - 0-85484-081-8 U1 - 61(091)548.7 W24 PB - LonDon:The Wellcome Trust Centre for the History of Medicine at University College ER -