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 BG009.08

  1. Bg009.08-80
    Wns Number
    BG009.08
    Country / Post
    Bulgaria
    Date of Issue
    April 25, 2008
    Subject
    History of Military Aviation - 95th Anniversary of birth of General Stoyanov and 90th Anniversary of birth of Captain D. Spisarevski
  2. Bg010.08-80
    Wns Number
    BG010.08
    Country / Post
    Bulgaria
    Date of Issue
    April 25, 2008
    Subject
    History of Military Aviation - 95th Anniversary of birth of General Stoyanov and 90th Anniversary of birth of Captain D. Spisarevski