Analysis of petroleum for trace metals : a symposium cosponsored by the Divisions of Analytical Chemistry and Petroleum Chemistry at the 169th meeting of the American Chemical Society, Philadelphia, Pa., April 10, 1975 - Hofstader, Robert A., 1936-; Runnels, John H., 1935-; Milner, Oscar I. (Oscar Irving), 1933- (Advances in chemistry series ;, 1976)