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Dyfyniad Arddull ChicagoCuff, Timothy. The Hidden Cost of Economic Development: The Biological Standard of Living in Antebellum Pennsylvania. Hampshire, England: Ashgate, 2005.
Dyfyniad MLACuff, Timothy. The Hidden Cost of Economic Development: The Biological Standard of Living in Antebellum Pennsylvania. Ashgate, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.