• publisher: University of Wisconsin
  • creator: Raymond Thayer Birge
  • contributor: University of Wisconsin - Madison
  • mediatype: texts
  • years: 1913
  • pages: 55
  • language: English
  • lccn: 14031270
  • notes: Reprinted from the Astrophysical journal, v. 39, January, 1914.
  • download: pdf file