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Dyfyniad Arddull ChicagoGaps in Technology between Member Countries: General Report. Paris: OECD, 1968.
Dyfyniad MLAGaps in Technology between Member Countries: General Report. Paris: OECD, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.