Thirtieth annual mining symposium and the Forty-second annual meeting of the Minnesota Section, AIME, January 13-15, 1969, Duluth, Minnesota /

Eitemau Tebyg

• Twenty-ninth annual mining symposium and the Forty-first annual meeting of the Minnesota Section, AIME, January 15-17, 1968, Duluth, Minnesota /
  Cyhoeddwyd: (1968)
• Twenty-third annual mining symposium and the annual meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota /
  Cyhoeddwyd: (1962)
• Twenty-fourth annual mining symposium and the annual meeting of the Minnesota Section, AIME, January 14-16, 1963, Duluth, Minnesota /
  Cyhoeddwyd: (1963)
• 48th Annual meeting of the Minnesota Section, AIME, and 36th annual Mining Symposium, January 15, 16, 17, 1975, Duluth, Minnesota : [proceedings] /
  Cyhoeddwyd: (1975)
• Twenty-sixth annual mining symposium and the Thirty-eighth annual meeting of the Minnesota Section, AIME, January 11-13, 1965, Duluth, Minnesota /
  Cyhoeddwyd: (1965)