• publisher: Urbana : University of Illinois
  • creator: Richards, Charles Russ, 1871-
  • Keyword: University of Illinois (Urbana-Champaign campus). Engineering Experiment Station.
  • years: 1921.
  • pages: 21 p. ;
  • class: TA417.I3
  • notes: "February 14, 1921."
  • download: pdf file