Carr, Albert H. Z., John D. Rockefeller's secret weapon. [print] - [first edition. - New York, McGraw-Hill (c)1962. - 383 pages 22 cm. LCCN: 62010598 Subjects--Personal Names: Rockefeller, John D. 1839-1937. Subjects--Corporate Names: Union Tank Car (Firm) LC Class. No.: CT275.C311.J646 1962 CT275