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Dyfyniad Arddull ChicagoRymer, K.W. Red Alder in British Columbia. Canada: Department of resources and development, Forest Branch, 1951.
Dyfyniad MLARymer, K.W. Red Alder in British Columbia. Department of resources and development, Forest Branch, 1951.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.