J180, 13th Conference of International Union for Quatenary Research《第十三届国际第四纪研究联合会大会》
J180, 13th Conference of International Union for Quatenary Research《第十三届国际第四纪研究联合会大会》 Stamp Title: 13th Conference of International Union for Quatenary Research Serial number: J180 Values in set: 1 (1-1), 13th Conference of International Union for Quaternary Research, 20 fen, 40*30 mm Denomination: 20 fen Date of issue: August 2, 1991 Designer: Wang Huming Size of [...]