Pfleider, E. P., & Berger, F. E. (1970). Thirty-first annual mining symposium and the forty-third annual meeting of the Minnesota section, AIME. Minneapolis: University of Minnesota.
Παραπομπή Chicago StylePfleider, Eugene P., and Fred E. Berger. Thirty-first Annual Mining Symposium and the Forty-third Annual Meeting of the Minnesota Section, AIME. Minneapolis: University of Minnesota, 1970.
Παραπομπή MLAPfleider, Eugene P., and Fred E. Berger. Thirty-first Annual Mining Symposium and the Forty-third Annual Meeting of the Minnesota Section, AIME. Minneapolis: University of Minnesota, 1970.
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