1. Philatelic 72/22/1/23 Reference (shelfmark): Philatelic 72/22/1/23 Title: The People's Republic of China Postage Stamp Issue: Chairman Mao's Directives on Industrial Teaching, Dazhai Red Banner Scope & Content: Stamps designed by Li Yinqing. Manufactured by the Beijing Postage Stamp Printing Works using a photogravure printing process. Collection Area: Philatelic Collections Languages: English Date Range: 30 Sep 1974 Extent: 5 Items