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Dyfyniad Arddull ChicagoMerrett, J. D. Social Class Distribution of Respiratory Tuberculosis Mortality in N. Ireland, 1949-53. 1959.
Dyfyniad MLAMerrett, J. D. Social Class Distribution of Respiratory Tuberculosis Mortality in N. Ireland, 1949-53. 1959.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.