Title: Lun yong ji
Description: Ben shu gong 10 zhang, Qian 4 zhang zhu yao lun shu"yong ji"de yi xie gui lü, Xing zhi, Yuan li he te zheng, Hou 6 zhang ying yong bu fen she ji jing ji jian she, Ke chi xu fa zhan he she hui fa zhan de zhu yao fang mian yu re dian wen ti.
Subjects: Wen ti, Ren kou, Ren kou ., Yan jiu, Overpopulation, Environmental aspects, Economic aspects, Quality of life
Places: Shi jie .