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Dyfyniad Arddull ChicagoCoen, Robert Morton. Tax Policy and Investment in Manufacturing 1954-1966. Evanston, Ill: s.n, 1967.
Dyfyniad MLACoen, Robert Morton. Tax Policy and Investment in Manufacturing 1954-1966. s.n, 1967.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.