• publisher: Washington, Govt. print. off.
  • creator: Universal Postal Union. Congress (7th : 1920 : Madrid, Spain) United States. Post-office dept. [from old catalog]
  • contributor: United States. Post-office dept. [from old catalog]
  • Keyword: Postal conventions.
  • years: 1923.
  • pages: iv, 163 p.
  • class: HE6251 1920d
  • download: pdf file