1972
Earth Sciences
![[Earth Sciences, type OX]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-728f36b493725fbea891bf75e323c2be.jpg)
![[Earth Sciences, type OY]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-7204e3ceed9059e7ab9b06e549c87dd2.jpg)
![[Earth Sciences, type OZ]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-ffff91b15d5de0447a79edef02eccfc6.jpg)
![[Earth Sciences, type PA]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-ffb079adeb7645c50d03e96cd674da48.jpg)
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