1.

図書
図書
1. The geology of the metamorphosed Biwabik iron-formation, eastern Mesabi district, Minnesota
James Novotny Gundersen and George M. Schwartz
出版情報: Minneapolis : University of Minnesota Press, 1962
シリーズ名: Bulletin (Minnesota Geological Survey) ; 43
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2.

図書
図書
2. Minnesota's rocks and waters : a geological story. rev. ed
by George M. Schwartz and George A. Thiel ; with the assistance of Peggy Harding Love
出版情報: Minneapolis : Minnesota University Press, c1963
シリーズ名: Minnesota geological survey ; bull. 37
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