Columbium metallurgy ; proceedings of a symposium sponsored by the Hudson-Mohawk Section, in cooperation with the Metallurgical Society, American Institute of Mining, Metallurgical, and Petroleum Engineers, Bolton Landing, New York, June 9-10, 1960 - Douglass, D. L. (David Leslie), 1931-; Kunz, Fred W. (Metallurgical Society conferences, 1961)