Australia Philately: 1971 12th International Conference On Cosmic Rays

A temporary post office was provided at Hobart for the 12th International Conference on Cosmic Rays (16th-25th August, 1971).

Details

• Date: 16 August 1971 – 25 August 1971
• Quantity:
  • 3705 (ordinary articles)
  • 39 (registered articles)