Original oil and gas trade magazine vintage ad for THE NATIONAL SUPPLY COMPANY of Pittsburgh, PA. Treasure map for new pay. Finding gold in their own back yard is a term that is rapidly being applied to more and more hitherto depleted oil reservoirs. Through the technique of modern water flooding, a growing number or fields are substantially increasing their yields and even near depleted pools are being stored to profitable operations. Keep your eye on National Blue for everything that is profitably modern in both production and drilling equipment. This unique 1953 old multi-page petroleum industry magazine advertisement would display beautifully matted and framed. Four page gatefold advertisement.