Mining Symposium Duluth, Minn, University of Minnesota, Duluth Branch, American Institute of Mining and Metallurgical Engineers. Minnesota Section. Meeting, Pfleider, E. P., & Anderson, A. E. (1962). Twenty-third annual mining symposium and the annual meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. University of Minnesota.

Mining Symposium Duluth, Minn, Duluth Branch University of Minnesota, American Institute of Mining and Metallurgical Engineers. Minnesota Section. Meeting, Eugene P. Pfleider, và Arthur E. Anderson. Twenty-third Annual Mining Symposium and the Annual Meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. Minneapolis: University of Minnesota, 1962.

Mining Symposium Duluth, Minn, et al. Twenty-third Annual Mining Symposium and the Annual Meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. University of Minnesota, 1962.