China Historical GIS, Harvard University and Fudan University CC BY-NC 4.0 https://maps.cga.harvard.edu/tgaz/placename/hvd_111549 汝州防禦使 汝州防御使 Ru Zhou Fangyushi 防镇 防鎮 fang zhen defense command 789 4 813 4 POINT point N 34.16176 E 112.83702 唐 Tang CHGIS