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Sheet:

Colnect-4561-626-Block-Centenary-of-Mendeleev-s-Periodic-Law-of-Elements.jpg
Issued by: Russia
Function: postage
Date: 6/20/1969
Issue: Periodic Law 100th
Denom: 30k
Color: carmine
Design: sheet
Watermark: unwmk
Perf: 12
Catalog value: