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Dyfyniad Arddull ChicagoCAPPER, P. Leonard, W. Fisher CASSIE, and James D. GEDDES. Problems in Engineering Soils.--Ed. SI. New Dehli: Oxford and IBH, 1971.
Dyfyniad MLACAPPER, P. Leonard, et al. Problems in Engineering Soils.--Ed. SI. Oxford and IBH, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.