China Historical GIS, Harvard University and Fudan University CC BY-NC 4.0 https://maps.cga.harvard.edu/tgaz/placename/hvd_111656 幽州盧龍節度使 幽州卢龙节度使 Youzhoululong Jiedushi 防镇 防鎮 fang zhen defense command 762 2 906 2 POINT point N 39.74125 E 116.13558 唐 Tang CHGIS