Gruner, John Walter2016-03-092016-03-091922-09https://hdl.handle.net/11299/178102University of Minnesota Ph.D. dissertation. September 1922. Major: Geology. Advisor: Dr. W. H. Emmons and Dr. F. F. Grout. 1 computer file (PDF); 54 pages. [407-460]. Reprinted in Economic Geology.enGeologyThe Origin of Sedimentary Iron Formations: The Biwabik Formation of the Mesabi RangeThesis or Dissertation