Dowdell, Ralph Lewis2016-04-262016-04-261921-05https://hdl.handle.net/11299/179538University of Minnesota Masters thesis. May 1921. Major: Metallography. Advisor: Dr. O. E. Harder, Professor F. W. Springer, Dr. C. A. Mann. 1 computer file (PDF); 71 pages.enMetallographyThesis or Dissertation