University of Minnesota Masters thesis. June 1922. Major: Geology. Advisor: Dr. F. F. Grout, Dr. W. H. Emmons, Dr. I. W. Geiger, Dr. F. J. Alway. 1 computer file (PDF); 30 pages.
Schmitt, Harrison Ashley.
An Experimental Investigation as to the Possible Commercial Production of Potash from Minnesota Rocks.
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