China 2221-2224

China PRC 2221-2224, MNH, $1.25. Michel 2244-2247. Achievements in Engineering and Construction, 1989. Beijing Telecommunications Building; Xi Qu Coal Mine, Gu Jiao, Shanxi Province; Long Yang Jiao Hydroelectric Power Station, Qinghai Province; Da Yo Shan Tunnel of the Guangzhou-Heng Yang Railway.