United Nations has assigned 2011 as the International Year of Chemistry. Picture on this stamp set: 1/2 Artoindonesianin C compound founded by Research Group of Organic Chemistry on Natural Materials from ITB, 2/2 The IYC Logo.
Unofficial Cover with Block of Four Stamps
Unofficial Maximum Cards
On the left is the Official First Day Cover, and on the right is cover sent with Domestic Registered Mail.
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