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Dyfyniad Arddull ChicagoNewland, Kathleen. Infant Mortality and the Health of Societies. Washington, D.C.: Worldwatch Institute, 1981.
Dyfyniad MLANewland, Kathleen. Infant Mortality and the Health of Societies. Worldwatch Institute, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.