Jinming Lei@heritage conservation center in Hebei Province--Xueyan Ren@the Heritage Institute in Hebei Province--;
Nihewan culture; Maquan ditch Ruins; Reinforcement rernovement relocation of ancient elephant's footprints;
机译:古大象脚印的加固搬迁搬迁与保护技术杨源“尼北文化”河北省Maquan Ditch Ruins