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Dyfyniad Arddull ChicagoWagner, Edmund G., và J. N. Lanoix. Excreta Disposal for Rural Areas and Small Communities. Geneva: World Health Organization, 1958.
Dyfyniad MLAWagner, Edmund G., và J. N. Lanoix. Excreta Disposal for Rural Areas and Small Communities. Geneva: World Health Organization, 1958.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.