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Books about Hepin:
Collier's Encyclopedia Vol. 10 Hep-ins by William T. Couch and William T. Couch (1958)
Wiki information Hepin:
Hepingmen, literally meaning the Gate of Peace, was a gate in Beijing's former city wall. In the 1960s, the gate was torn down to make room for Beijing's second ring road. Today, Hepingmen is a transport node in Beijing as well as the location of...