1. Philatelic 72/22/1/51 Reference (shelfmark): Philatelic 72/22/1/51 Title: The People's Republic of China Postage Stamp Issue: National Conference on Learning from Daqing in Industry Scope & Content: Stamps designed by Zhang Kerang and Li Yinqing. Manufactured by the Beijing Postage Stamp Printing Works using a photogravure printing process. Collection Area: Philatelic Collections Languages: English Date Range: 25 Apr 1977 Extent: 4 Items