Third international safety conference. (1975). Hazards in tunnelling and on falsework. Institution of civil engineers.
Dyfyniad Arddull ChicagoThird international safety conference. Hazards in Tunnelling and on Falsework. London: Institution of civil engineers, 1975.
Dyfyniad MLAThird international safety conference. Hazards in Tunnelling and on Falsework. Institution of civil engineers, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.