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Dyfyniad Arddull ChicagoSmith, Henry Nash. Virgin Land: The American West as Symbol and Myth. Nueva York: Random House, 1950.
Dyfyniad MLASmith, Henry Nash. Virgin Land: The American West as Symbol and Myth. Random House, 1950.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.