Stamps, international congresses design type

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Russia

postage

1968, May 30 international congresses unwmk p. 12
Soviet_stamp_1968_Kongrss_po_Efirnym_Maslam_6k.JPGColnect-4542-040-Power-Station-and-Emblem-of-7th-World-Power-Conference.jpg
X 6k multi oils
X 6k multi c.energy

1968, May 30 8th Congress for Mineral Research issue - international congresses
Colnect-4542-031-8th-Congress-for-the-Development-of-Mineral-Resources.jpg
X 6k multi crystal

1968, May 30 13th Entomological Congress issue - international congresses
Colnect-4542-046-Ground-Beetle-Carabus-schoenherri-Emblem-of-13th-Entomolo.jpg
X 6k multi Carabus schoenherri Emblem of 13th Entomological Congress

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