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 CR012.10

  1. Cr012.10-80
    Wns Number
    CR012.10
    Country / Post
    Costa Rica
    Date of Issue
    August 26, 2010
    Subject
    Higher Education
  2. Cr013.10-80
    Wns Number
    CR013.10
    Country / Post
    Costa Rica
    Date of Issue
    August 26, 2010
    Subject
    Higher Education