taking Bianliang (now Kaifeng), capital of the Northern Song Dynasty, as the model. According to Ming Dynasty survey records, the Jin city walls had a perimeter of about 18 kilometers. Mongol ...
In 1841 the Yellow River overflowed and the city of Kaifeng was flooded ... from twenty-eight standard brick components. The outer walls, comer pillars, doors, windows and bracket supports ...
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