space-based observatories issue of Poland
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Short desc: space-based observatories
Issuer: Poland Date: 6/20/1973 Occasion: unset Consists of 2 stamps: (See stamps as list) 4.90z d=US Copernicus 4.90z d=Salyut (1973) All are perf=9-14.5 Record of changes |
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