Customs duty exemption for oleopine resin used in gum rosin and turpentine manufacture waives additional duty. Exempts oleopine resin imported for the manufacture of gum rosin and turpentine by limiting the effective basic customs duty to an amount calculated at the prescribed ad valorem rate and by exempting such imports from the additional duty under the Customs Tariff Act; the exemption applies to imports classified under the specified tariff sub heading and is time limited to the period stated in the notification.