• publisher: Washington, D.C. : National Research Council of the National Academy of Sciences
  • creator: National Research Council (U.S.)
  • contributor: National Research Council (U.S.)
  • Keyword: Research.
  • years: 1919-1950.
  • pages: 123 v. :
  • class: Q11
  • isbn: 0096-5227
  • notes: Title from cover.
  • download: pdf file