International Labour Office. (1982). 6th international report on the prevention and suppression of dust in mining, tunnelling and quarrying, 1973-1977. International Labour Office.
Dyfyniad Arddull ChicagoInternational Labour Office. 6th International Report on the Prevention and Suppression of Dust in Mining, Tunnelling and Quarrying, 1973-1977. Geneva: International Labour Office, 1982.
Dyfyniad MLAInternational Labour Office. 6th International Report on the Prevention and Suppression of Dust in Mining, Tunnelling and Quarrying, 1973-1977. International Labour Office, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.