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Dyfyniad Arddull ChicagoCapper, P Leonard, and W Geddes Cassie Fisher. Problems in Engineering Soil. 3rd ed. London: E & F. N Spon, 1980.
Dyfyniad MLACapper, P Leonard, and W Geddes Cassie Fisher. Problems in Engineering Soil. 3rd ed. E & F. N Spon, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.