I remembered I could zoom in on the picture and I can see the third one is entitled, "Tenth Anniversary of the World's First Manned Space Flight", along with a picture of Yuri Gagarin.
The 1922-1982 date range of the first one, as well as the general stamp design, resemble Scott Russia design A2430, #s 5091-5096, the 60th anniversary of the USSR.
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