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Dyfyniad Arddull ChicagoFrohlich, Burkhard. Metal Architecture Design and Construction. Boston: Publisers for Architecture, 2003.
Dyfyniad MLAFrohlich, Burkhard. Metal Architecture Design and Construction. Boston: Publisers for Architecture, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.