THE Hangu Pass, 15 kilometers north of Lingbao City in Henan Province, was one of China's earliest military fortifications. It guarded the sole path, through deep gorges flanked by steep mountains,...
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THE Hangu Pass, 15 kilometers north of Lingbao City in Henan Province, was one of China's earliest military fortifications. It guarded the sole path, through deep gorges flanked by steep mountains,...