The World Association for the Development of Philately (WADP) and the Universal Postal Union (UPU) jointly conceived and developed the WADP Numbering System - WNS, which was launched on 1 January 2002.

Stamps issued with AR019.09

  1. Ar019.09-80
    Wns Number
    AR019.09
    Country / Post
    Argentina
    Date of Issue
    June 27, 2009
    Subject
    Environmental Protection - Water
  2. Ar020.09-80
    Wns Number
    AR020.09
    Country / Post
    Argentina
    Date of Issue
    June 27, 2009
    Subject
    Environmental Protection - Water