Ball, James O. (James Ogden), 1894-Creighton, Peter J.2023-02-162023-02-161957https://hdl.handle.net/11124/16434Includes bibliographical references (pages 70-72).masters thesesengCopyright of the original work is retained by the author.Petroleum -- RefiningVanadiumPorphyrinsExtraction of the vanadium-porphyrin complex from petroleum gas oils, TheText