China Historical GIS, Harvard University and Fudan University CC BY-NC 4.0 https://maps.cga.harvard.edu/tgaz/placename/hvd_111517 東畿汝州都防禦使 东畿汝州都防御使 Dongjiruzhou Dufangyushi 防镇 防鎮 fang zhen defense command 785 4 785 4 POINT point N 34.66528 E 112.38263 唐 Tang CHGIS